Quran 33:56: O believers! Invoke Allah’s blessings upon him (Rasulullah), and salute him with worthy greetings of peace.

Reference: Quran: Al-Ahzab 33:56

Quran: Al-Ahzab (33:56)
Dr. Mustafa Khattab, the Clear Quran

Indeed, Allah showers His blessings upon the Prophet, and His angels pray for him. O believers! Invoke Allah’s blessings upon him, and salute him with worthy greetings of peace.

إِنَّ ٱللَّهَ وَمَلَٓئِكَتَهُۥ يُصَلُّونَ عَلَى ٱلنَّبِىِّۚ يَٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ صَلُّوا۟ عَلَيْهِ وَسَلِّمُوا۟ تَسْلِيمًا
Reference  : Quran: Al-Ahzab 33:56
 
Bashir b. S'ad said: Allah has commanded us to bless you. Messenger of Allah! But how should we bless you?

Reference: Sahih Muslim 405

Sahih Muslim 405
Abdullah b. Zaid-he who was shown the call (for prayer in a dream) narrated it on the authority of Abu Mas'ud al-Ansari who said:

We were sitting in the company of Sa'id b. 'Ubida when the Messenger of Allah (ﷺ) came to us. Bashir b. S'ad said: Allah has commanded us to bless you. Messenger of Allah! But how should we bless you? He (the narrator) said: The Messenger of Allah (ﷺ) kept quiet (and we were so much perturbed over his silence) that we wished we had not asked him. The Messenger of Allah (ﷺ) then said: (For blessing me) say: "O Allah, bless Muhammad and the members of his household as Thou didst bless the members of Ibrahim's household. Grant favours to Muhammad and the members of his household as Thou didst grant favours to the members of the household of Ibrahim in the world. Thou art indeed Praiseworthy and Glorious" ; and salutation as you know.

 

Transliteration: Alahumma salli 'ala Muhammad wa 'ala ali Muhammad, kama sallaita 'ala Ibrahima wa barik 'ala Muhammad wa 'ala ali Muhammad kama barakta 'ala ali Ibrahim fil-'alamin, innaka hamidun majid.

حَدَّثَنَا يَحْيَى بْنُ يَحْيَى التَّمِيمِيُّ، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نُعَيْمِ بْنِ عَبْدِ اللَّهِ الْمُجْمِرِ، أَنَّ مُحَمَّدَ بْنَ عَبْدِ اللَّهِ بْنِ زَيْدٍ الأَنْصَارِيَّ، - وَعَبْدُ اللَّهِ بْنُ زَيْدٍ هُوَ الَّذِي كَانَ أُرِيَ النِّدَاءَ بِالصَّلاَةِ - أَخْبَرَهُ عَنْ أَبِي مَسْعُودٍ الأَنْصَارِيِّ قَالَ أَتَانَا رَسُولُ اللَّهِ صلى الله عليه وسلم وَنَحْنُ فِي مَجْلِسِ سَعْدِ بْنِ عُبَادَةَ فَقَالَ لَهُ بَشِيرُ بْنُ سَعْدٍ أَمَرَنَا اللَّهُ تَعَالَى أَنْ نُصَلِّيَ عَلَيْكَ يَا رَسُولَ اللَّهِ فَكَيْفَ نُصَلِّي عَلَيْكَ قَالَ فَسَكَتَ رَسُولُ اللَّهِ صلى الله عليه وسلم حَتَّى تَمَنَّيْنَا أَنَّهُ لَمْ يَسْأَلْهُ ثُمَّ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم قُولُوا ‏ "‏ اللَّهُمَّ صَلِّ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ كَمَا صَلَّيْتَ عَلَى آلِ إِبْرَاهِيمَ وَبَارِكْ عَلَى مُحَمَّدٍ وَعَلَى آلِ مُحَمَّدٍ كَمَا بَارَكْتَ عَلَى آلِ إِبْرَاهِيمَ فِي الْعَالَمِينَ إِنَّكَ حَمِيدٌ مَجِيدٌ ‏.‏ وَالسَّلاَمُ كَمَا قَدْ عَلِمْتُمْ ‏"‏ ‏.‏
Reference  : Sahih Muslim 405
In-book reference  : Book 4, Hadith 69
 
The Prophet (ﷺ) said: If anyone invokes blessings on me once, Allah will bless him ten times.

Reference: Sunan Abi Dawud 1530

Sunan Abi Dawud 1530
Narrated Abu Hurayrah:

The Prophet (ﷺ) said: If anyone invokes blessings on me once, Allah will bless him ten times.

حَدَّثَنَا سُلَيْمَانُ بْنُ دَاوُدَ الْعَتَكِيُّ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ جَعْفَرٍ، عَنِ الْعَلاَءِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ مَنْ صَلَّى عَلَىَّ وَاحِدَةً صَلَّى اللَّهُ عَلَيْهِ عَشْرًا ‏"‏ ‏.‏
Reference  : Sunan Abi Dawud 1530
In-book reference  : Book 8, Hadith 115