Spend on Charity, Allah will spend on you

 عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ، أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ:

" قَالَ اللَّهُ: أَنْفِقْ يَا ابْنَ آدَمَ، أُنْفِقْ عَلَيْكَ "

On the authority of Abu Harayrah (may Allah be pleased with him) from the Prophet (ﷺ), who said:

Allah (mighty and sublime be He) said: Spend (on charity), O son of Adam, and I shall spend on you.
It was related by al-Bukhari (also by Muslim).