Muwatta Imam Malik Book of Sadaqa, Hadith 1

Malik related to me from Yahya ibn Said from Abu'l-Hubab Said ibn Yasar that the Messenger of Allah ﷺ said, "Whoever gives sadaqa from good earning - and Allah only accepts the good - it is as if he placed it in the palm of the Merciful to raise it, as one of you raises his foal or young camel until it is like the mountain "

حَدَّثَنِي مَالِكٌ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ أَبِي الْحُبَابِ، سَعِيدِ بْنِ يَسَارٍ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ " مَنْ تَصَدَّقَ بِصَدَقَةٍ مِنْ كَسْبٍ طَيِّبٍ - وَلاَ يَقْبَلُ اللَّهُ إِلاَّ طَيِّبًا - كَانَ إِنَّمَا يَضَعُهَا فِي كَفِّ الرَّحْمَنِ يُرَبِّيهَا كَمَا يُرَبِّي أَحَدُكُمْ فَلُوَّهُ أَوْ فَصِيلَهُ حَتَّى تَكُونَ مِثْلَ الْجَبَلِ " .