مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4034
Musnad of Abdullah bin Mas'ood
It was narrated that Abu wa'il said: ‘Abdullah used to give a reminder every Thursday, and it was said to him: We wish you would give us a reminder every day. He said: I do not like to bore you: The Messenger of Allah (ﷺ) used to choose the right time to exhort us for fear of boring us.
Musnad Ahmad 4060lts isnad is saheeh, al-Bukhari (70) and Muslim (2821)]