Allah said: 'O son of Adam, spend, and I will spend on you.'

The Hadīth urges us to give charity and spend in the cause of Allah.
Charitable spending is one of the greatest means for multiplying one's sustenance, attaining blessing therein, and getting compensated by Allah for what was spent.
This is one of the Hadīths the Prophet (may Allah's peace and blessings be upon him) narrated about his Lord. They are called qudsi or divine Hadīths, and their wordings and meanings are attributed to Allah. However, qudsi Hadīths do not possess the traits of the Qur'an that distinguish it from anything else, like reciting it as a form of worship, getting purified for it, presenting it as a challenge, its miraculousness, etc.