Hadith 27

Riyad as-Salihin

Book 5: The Book of Greetings

Chapter 140

Seeking Permission to Enter (Someone's House) and Manners Relating to It

باب الاستئذان وآدابه

Riyad as-Salihin 870
وعن أبي موسي الأشعري رضي الله عنه قال‏:‏ قال رسول الله صلى الله عليه وسلم ‏:‏ “ الاستئذان ثلاث، فإن أذن لك وإلا فارجع‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏
Abu Musa Al-Ash'ari (May Allah be pleased with him) reported:

The Messenger of Allah (ﷺ) said, "Permission is to be sought thrice. If permission is granted, you may enter; otherwise, go back."[Al- Bukhari and Muslim].