Allah, Owner of Bounty and Generous, commands mankind to believe and spend in his cause

 I take refuge with Allaah from the accursed devil. 
بِسْمِ اللَّهِ الرَّحْمَـنِ الرَّحِيمِ
  Bismillah-ir-Rahman-ir-Raheem: In the name of Allah, the Compassionate, the Merciful. 
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  May the Peace and Blessing of Allah Azza wa Jal, our Lord Glorified and Praised be He, be upon our beloved  Prophet, his Family, and Companions.
Allah, Owner of Bounty and Generous, commands mankind to believe and spend in his cause.
ءَامِنُواْ بِاللَّهِ وَرَسُولِهِ وَأَنفِقُواْ مِمَّا جَعَلَكُم مُّسْتَخْلَفِينَ فِيهِ فَالَّذِينَ ءَامَنُواْ مِنكُمْ وَأَنفَقُواْ لَهُمْ أَجْرٌ كَبِيرٌ
(7. Believe in Allah and His Messenger, and spend of that whereof He has made you trustees. And such of you as believe and spend, theirs will be a great reward.)
 وَمَا لَكُمْ لاَ تُؤْمِنُونَ بِاللَّهِ وَالرَّسُولُ يَدْعُوكُمْ لِتُؤْمِنُواْ بِرَبِّكُمْ وَقَدْ أَخَذَ مِيثَـقَكُمْ إِن كُنتُمْ مُّؤْمِنِينَ
 (8. And what is the matter with you that you believe not in Allah! While the Messenger invites you to believe in your Lord; and He has indeed taken your covenant, if you are real believers.)
هُوَ الَّذِى يُنَزِّلُ عَلَى عَبْدِهِ ءَايَـتٍ بَيِّنَـتٍ لِّيُخْرِجَكُمْ مِّنَ الظُّلُمَـتِ إِلَى النُّورِ وَإِنَّ اللَّهَ بِكُمْ لَرَءُوفٌ رَّحِيمٌ
(9. It is He Who sends down manifest Ayat to His servant that He may bring you out from darkness into light. And verily, Allah is to you full of kindness, Most Merciful.)
Surah 57 Al Hadid Verse 7-9
Tafsir Ibn Kathir
Allah the Exalted and Blessed orders having perfect faith in Him and in His Messenger, and that one should persist on this path adhereing firmly to it. Allah encourages spending from what He has made mankind trustees of, the wealth that you – mankind – have, that He has lent you. This wealth was in the hands of those before you and was later transferred to you. Therefore, O mankind, spend as Allah commanded you from the wealth that He entrusted to you for His obedience. Otherwise, He will hold you accountable and punish you for your ignoring what He ordained on you in this regard. Allah’s statement,
(of that whereof He has made you trustees.), indicates that you – mankind — will surrender this wealth to someone else. In this case, those who will inherit from you might obey Allah with their wealth, and thus acquire more happiness than you on account of what Allah has granted them. They might disobey Allah, and in this case you will have helped them commit evil and transgression. Imam Ahmad recorded that `Abdullah bin Ash-Shikhkhir said, “I came to Allah’s Messenger as he was reciting and saying,
((abundance diverts you.)( The Son of `Adam claims, “My wealth, my wealth.” But is there anything belonging to you, except that which you consumed, which you used, or which you wore and then it became worn or you gave as charity and sent it forward) Muslim also collected with the addition:
(Other than that, you will go away from it and leave it behind for other people.) Allah’s statement,
(And such of you as believe and spend, theirs will be a great reward.) encourages having faith and spending in acts of obedience. Allah the Exalted said,
(And what is the matter with you that you believe not in Allah! While the Messenger invites you to believe in your Lord;) meaning, “what prevents you from believing, while the Messenger is among you calling you to faith and bringing forward clear proofs and evidences that affirm the truth of what he brought you” And we have reported the Hadith through different routes in the beginning of the explanation on the chapter on Faith in Sahih Al-Bukhari, wherein one day the Messenger of Allah said to his Companions,
(Who do you consider among the believers as having the most amazing faith) They said, “The angels.” He said,
(And what prevents them from believing when they are with their Lord) They said, “Then the Prophets.” He said,
(What prevents them from believing when the revelation comes down to them) They said, “Then us.” He said,
(What prevents you from believing, when I am amongst you Actually, the believers who have the most amazing faith, are some people who will come after you; they will find pages that they will believe in.) We mentioned a part of this Hadith when explaining Allah’s statement in Surat Al-Baqarah,
(who believe in the Ghayb (unseen).)(2:3) Allah’s statement,
(and He has indeed taken your covenant,) is similar to another of His statements,
(And remember Allah’s favor to you and His covenant with which He bound you when you said: “We hear and we obey.”)(5:7), which refers to giving the pledge of allegiance to the Prophet . Ibn Jarir said that the covenant mentioned here, is that taken from mankind, when they were still in Adam’s loin. This is also the opinion of Mujahid, and Allah knows best. Allah said,
(It is He Who sends down manifest Ayat to His servant) clear proofs, unequivocal evidences and plain attestations,
(that He may bring you out from darkness into light.) from the darkness of ignorance, disbelief and contradictory statements to the light of guidance, certainty and faith,
(And verily, Allah is to you full of kindness, Most Merciful.) by revealing the Divine Books and sending the Messengers to guide mankind, eradicating doubts and removing confusion. After Allah commanded mankind to first believe and spend, He again encouraged them to acquire faith and stated that He has removed all barriers between them and the acquisition of faith. Allah again encouraged them to spend,
(And what is the matter with you that you spend not in the cause of Allah And to Allah belongs the heritage of the heavens and the earth.) means, spend and do not fear poverty or scarcity. Surely, He in Whose cause you spent is the King and Owner of the heavens and earth and has perfect control over their every affair, including their treasuries. He is the Owner of the Throne, with all the might that it contains, and He is the One Who said,
(And whatsoever you spend of anything, He will replace it. And He is the best of providers.)(34:39), and,
(whatever is with you, will be exhausted, and whatever is with Allah will remain.)(16:96) Therefore, those who trust in and depend on Allah will spend, and they will not fear poverty or destitution coming to them from the Owner of the Throne. They know that Allah will surely compensate them for whatever they spend.