The Messenger of Allah (ﷺ) said, “If you hear the crow of a rooster, ask Allah for his bounty for it has seen an angel.” Say:

اَللَّهُمَّ إِنِّي أَسْأَلُكَ مِنْ فَضْلِكَ

Allaahumma innee as’aluka min fadlik

O Allah, I ask You from Your favor.

Reference: Bukhari: 3303