It was narrated from Ibn "Abbas.

The Prophet (ﷺ) was in Makkah, then he was commanded to migrate and the verse was revealed to him: “And say (O Muhammad (ﷺ)) : My Lord! Let my entry (to the city of Al Madinah) be good, and (likewise) my exit (from the city of Makkah) be good. And grant me from You an authority to help me (or a firm sign or a proof" al-Isra" 17:80].