That when he went to 'Umar during his Caliphate. 'Umar said to him,
"Haven't I been told that you do certain jobs for the people but when
you are given payment you refuse to take it?" 'Abdullah added: I said,
"Yes." 'Umar said, "Why do you do so?" I said, "I have horses and
slaves and I am living in prosperity and I wish that my payment should
be kept as a charitable gift for the Muslims." 'Umar said, "Do not do
so, for I intended to do the same as you do. Allah's Messenger (ﷺ)s used to
give me gifts and I used to say to him, 'Give it to a more needy one
than me.' Once he gave me some money and I said, 'Give it to a more
needy person than me,' whereupon the Prophet (ﷺ) said, 'Take it and keep
it in your possession and then give it in charity. Take what ever
comes to you of this money if you are not keen to have it and not
asking for it; otherwise (i.e., if it does not come to you) do not
seek to have it yourself.' "
Sahih al-Bukhari Book 93, Hadith 27
Ka`b demanded his debt back from Ibn Abi Hadrad in the Mosque and their voices grew louder till
Allah's Messenger (ﷺ) heard them while he was in his house. He came out to them raising the curtain of his
room and addressed Ka`b, "O Ka`b!" Ka`b replied, "Labaik, O Allah's Messenger (ﷺ)." (He said to him),
"Reduce your debt to one half," gesturing with his hand. Ka`b said, "I have done so, O Allah's
Apostle!" On that the Prophet (ﷺ) said to Ibn Abi Hadrad, "Get up and repay the debt, to him."
Sahih al-Bukhari Book 44, Hadith 8
"Allah,Most High said:
'O My Slaves! All of you are astray except whom I guide, so ask Me for guidance and I shall guide you. All of you are poor except whom I enrich, so ask Me and I shall provide you. All of you are sinners except whom I have pardoned, so whoever among you knows that I am the One able to forgive, and seeks My forgiveness, I shall forgive him, without concern for Me (and it will not affect Me). If the first of you and the last of you, the living among you and the dead among you, the fresh among you and the dry among you were to gather together to help the heart with the most Taqwa among My slaves, that would not add a mosquito's wing to My sovereignty. If the first of you and the last of you, the living among you and the dead among you, the fresh among you and the dry among you were to gather together to help the worst heart of My slaves, that would not diminish a mosquito's wing to My sovereignty. I shall forgive him, without concern for Me (and it will not affect Me). If the first of you and the last of you, the living among you and the dead among you, the fresh among you and the dry among you were to gather together upon one plateau, and each person among them were to ask for his utmost desire, and I were to give each what he asked for, that would not diminish from My sovereignty, except as if one of you were to pass by an ocean and dip a needle into it and then remove it. That is because I am the Most Liberal without need, the Most Generous, doing as I will. I give by My speech and I punish by My speech, whenever I will something I only say: "Be" and it shall be.'" Another chain reports a similar narration.
Jami` at-Tirmidhi Book 37, Hadith 81