The people asked, "O Allah's Messenger (ﷺ)! How shall we (ask Allah to) send blessings on you?" Allah's Apostle replied, "Say: O Allah! Send Your Mercy on Muhammad and on his wives and on his off spring, as You sent Your Mercy on Abraham's family; and send Your Blessings on Muhammad and on his offspring, as You sent Your Blessings on Abraham's family, for You are the Most Praiseworthy, the Most Glorious."
Sahih al-Bukhari Book 60, Hadith 43
← Previous Hadith (The wife of the Prophet) Allah's Messenger (ﷺ) said (to her). "Don't you see that when your folk built the Ka`ba, they did not build it on all the foundations built by Abraham?" I said, "O Allah's Messenger (ﷺ)! Why don't we rebuild it on the foundations of Abraham?" He said. "But for the fact that your folk have recently given up infidelity (I would have done so). Narrated Ibn `Umar: Aisha must have heard this from Allah's Messenger (ﷺ) for I see that Allah's Messenger (ﷺ) used not to touch the two corners facing Al-Hijr only because the House had not been built on the foundations of Abraham.''

Sahih al-Bukhari Book 60, Hadith 42 Next Hadith → Ka`b bin Ujrah met me and said, "Shall I not give you a present I got from the Prophet?" `Abdur- Rahman said, "Yes, give it to me." I said, "We asked Allah's Messenger (ﷺ) saying, 'O Allah's Messenger (ﷺ)! How should one (ask Allah to) send blessings on you, the members of the family, for Allah has taught us how to salute you (in the prayer)?' He said, 'Say: O Allah! Send Your Mercy on Muhammad and on the family of Muhammad, as You sent Your Mercy on Abraham and on the family of Abraham, for You are the Most Praise-worthy, the Most Glorious. O Allah! Send Your Blessings on Muhammad and the family of Muhammad, as You sent your Blessings on Abraham and on the family of Abraham, for You are the Most Praise-worthy, the Most Glorious.' "

Sahih al-Bukhari Book 60, Hadith 44