(496) بَابُ إِذَا سَلَّمَ الرَّجُلُ عَلَى الرَّجُلِ فِي بَيْتِهِ
'Ubayd ibn Hunayn related to him that Abu Musa said, "I askedpermission three times to come in to 'Umar, but he did not give me permissionand so I went away. He said, ''Abdullah, is it hard on you to be kept waitingat your door.' I said, 'I asked permission from you three times and youdid not give me permission, so I went away (and we were commanded to dothat).' 'Umar said, 'From whom did you hear this?' I replied, 'I heardit from the Prophet, may Allah bless him and grant him peace.' 'Umar said,'Did you hear something from the Prophet, may Allah bless him and granthim peace, which I did not hear? If you do not bring me a clear proof,I will make an example of you!' Therefore I went to a group of Ansar whowere sitting in the mosque. I asked them and they said, 'Does anyone doubtthis?' I told them what 'Umar had said. They said, 'Only the youngest ofus will go with you.' So Abu Sa'id al-Khudri - or Abu Mas'ud -went with me to 'Umar. He said, 'We went out with the Prophet, may Allahbless him and grant him peace, when he was going to Sa'd ibn 'Ubada. Hegave the greeting, but Sa'd did not give permission. Then he greeted hima second time and then a third time, but Sa'd did not give him permission.So the Prophet said, 'We have done what we must.' Then he went back andSa'd caught up to him and said, 'Messenger of Allah! By the One who sentyou with the Truth, every time you greeted me, I heard and answered you,but I wanted to have a lot of greeting (peace) from you for me and thepeople of my house.'" Abu Musa said, "By Allah, I am a guardian of thehadith of the Messenger of Allah, may Allah bless him and grant him peace."'Umar said, "Yes, but I wanted to make sure."
Reference: Al-Adab Al-Mufrad 1073
In-book reference: Book 43, Hadith 23
English translation: Book 43, Hadith 1073