The Messenger of Allah (ﷺ) said to me: The sign that you have been permitted to come in is that the curtain is raised or that you hear me speaking quietly until I forbid you.
Sahih Muslim Book 39, Hadith 21
← Previous Hadith I was walking with Thibit al-Bunani that he happened to pass by children and he greeted them. And Thibit reported that he walked with Anas and he happened to pass by children and he greeted them. and Anas reported that he walked with Allah's Apostle (may peace be upon. him) and he happened, to pass by children and he greeted them.

Sahih Muslim Book 39, Hadith 20 Next Hadith → This hadith has been narrated on the authority of 'Ubaidullah with the same chain of transmitters.

Sahih Muslim Book 39, Hadith 22