It was narrated that Ubayy ibn Ka‘b (may Allah be pleased with him) said:
I said: O Messenger of Allah, I send a great deal of blessings upon you; how much of my du‘aa’ should be sending blessings upon you? He said: “Whatever you wish.” I said: One quarter? He said: “Whatever you wish, and if you do more, that will be better for you.” I said: One half? He said: “Whatever you wish and if you do more, that will be better for you.” I said: Two thirds? He said: “Whatever you wish and if you do more, that will be better for you.” I said: I will make all of my du‘aa’ for you. He said: “Then your concerns will be taken care of and your sins will be forgiven.”
At-Tirmidhi said: A saheeh hasan hadith. It was classed as hasan by al-Mundhiri in at-Targheeb wa’t-Tarheeb, and by al-Haafiz in al-Fath (11/168). In ash-Shu‘ab (2/215), al-Bayhaqi indicated that it is qawiy. It was classed as saheeh by al-Albaani in Saheeh at-Targheeb (1670) and elsewhere.
اللهمَّ صلِّ على محمَّد وعلى آل محمَّد، كما صليتَ على إبراهيم وعلى آل إبراهيم؛ إنَّك حميدٌ مجيد. اللهمَّ بارِك على محمَّد وعلى آل محمَّد، كما باركتَ على إبراهيم وعلى آل إبراهيم؛ إنَّك حميدٌ مجيد
Allaahumma salli ‘ala Muhammad wa ‘ala aali Muhammad kama salayta ‘ala Ibraaheem wa ‘ala aali Ibraaheem, innaka hameedun majeed. Allaahumma baarik ‘ala Muhammad wa ‘ala aali Muhammad kama baarakta ‘ala Ibraaheem wa ‘ala aali Ibraaheem, innaka hameedun majeed