Sahih Muslim Book 25, Hadith Number 5362.

Chapter : Asking permission to enter a house.

This hadith has been narrated on the authority of Talha b. Yahya with the same chain of transmitters but with this variation of wording: He (Hadrat ‘Umar) said: Abu Mundhir (the Kunya of Ubayy b. Ka’b), did you hear this from Allah’s Messenger (may peace be upon him)? Thereupon he said: Yes, and he further said: Ibn Khattab, do not be a torment for the Companions of Allah’s Messenger (may peace he upon him). No mention has, however, been made of the words of ‘Umar: “Hallowed be Allah” and what follows subsequently.