Surah Al-Ahzab (The Enemy Alliance), Verse 56

اِنَّ اللّٰهَ وَمَلٰٓىِٕكَتَهٗ یُصَلُّوْنَ عَلَی النَّبِیِّ یٰۤاَیُّهَا الَّذِیْنَ اٰمَنُوْا صَلُّوْا عَلَیْهِ وَسَلِّمُوْا تَسْلِیْمًا ۟

Innal laaha wa malaaa'i katahoo yusalloona 'alan Nabiyy; yaaa aiyuhal lazeena aamanoo salloo 'alaihi wa sallimoo tasleemaa

“Allah and His angels send blessings on the Prophet: O ye that believe! Send ye blessings on him, and salute him with all respect.”

Quran 33:56 (Yusuf Ali Translation)