Al-Adab Al-Mufrad: Abandonment – Hadith No. 408 — The Messenger of Allah, may Allah bless him and grant him peace, said, “It is… (Hadith No. 408)

Abu Ayyub al-Ansari reported that the Messenger of Allah, may Allah
bless him and grant him peace, said, "It is not lawful for a Muslim to
refuse to speak to his (Muslim) brother for more than three days so that
when they meet, one goes this way and the goes that way. The better of
the two is the one who initiates the greeting."

Explanation:

Reference: Al-Adab Al-Mufrad, Abandonment, Hadith No. 408