إِنَّ اللَّهَ يَأْمُرُكُمْ أَن تُؤَدُّوا الْأَمَانَاتِ إِلَىٰ أَهْلِهَا
“Indeed, Allah commands you to return trusts to their rightful owners.”
This is a well-known asbab al-nuzul: this ayah on returning trusts to those entitled to them was revealed regarding this exact moment -- the Prophet ﷺ returning the Ka'bah's key to Uthman ibn Talha rather than keeping it.