Utba ibn Rabi'ah
عتبة بن ربيعة
One of the prominent men of the Quraysh.Leader of the powerful bani Abd-Shams clan.
The prophet recited from the following chapter of the Quran:
The prophet would have ended his recitation at the point 9:12 which is the end of verse 37. The translation for verse 37 is as follows:
"And of His signs are the night and day and the sun and moon. Do not prostrate to the sun or to the moon, but prostate to Allah , who created them, if it should be Him that you worship."
This explains why the prophet used that verse as an opportunity to end his recitation to Utba, and why he ended by prostrating.