Yahya: from al-Khalil ibn Murra, from Abu Hashim Sahib al-Rumman, from Abd al-Rahman ibn Abi Layla, who said: "Ka'b ibn Ujra came to me and said: 'Shall I not give you a gift? While we were with the Messenger of Allah, a man said: O Messenger of Allah, we have come to know how to greet you [with peace], so how do we send blessings upon you?' He said: 'Say: O Allah, send blessings upon Muhammad and upon the family of Muhammad, as You sent blessings upon Ibrahim and the family of Ibrahim; indeed, You are Praiseworthy and Glorious. O Allah, send blessings [baraka] upon Muhammad and upon the family of Muhammad, as You sent blessings [baraka] upon Ibrahim and the family of Ibrahim; indeed, You are Praiseworthy and Glorious.'"
Yahya: from al-Mubarak ibn Fadala, from al-Hasan, who said: The Messenger of Allah (peace be upon him) said: "Increase your blessings upon me on the day of Friday."
Surah al-Ahzab, from verse 57 to verse 58.