Sahih Muslim | Book 32 | Chapter 6

Narrated by Abu Ayyub Ansiri
Abu Ayyub Ansiri reported Allah's Messenger (may peace be upon him) as saying: It is not permissible for a Muslim to have estranged relations with his brother beyond three nights, the one turning one way and the other turning the other way when they meet; the better of the two is one who is the first to give a greeting.

Narrated by Zuhri
This hadith has been transmitted on the authority of Zuhri with a slight variation of wording (and the words are): "The one turning away and the other turning away when they meet and one avoids the other and the other also avoids him.
Narrated by 'Abdullah b. 'Umar
'Abdullah b. 'Umar reported Allah's Messenger (may peace be upon him) as saying: It is not permissible for a Muslim to have estranged relations with his brother beyond three days.

Narrated by Abu Huraira
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: There should be no estranged relations beyond three days.