Hadith 1597
´It was narrated that Abu Hurairah said:` "Umar came in when the Ethiopians were playing in the masjid. Umar, may Allah (SWT) be pleased with him, rebuked them, but the Messenger of Allah (ﷺ) said: 'Let them be there, O Umar, for they are Banu Arfidah.'"
Hadith 3851
It was narrated from Ibn 'Umar, that 'Umar had vowed to spend a night in 'Itikaf during the Jahiliyyah. He asked the Messenger of Allah about that, and he ordered him to perform the 'Itikaf.