Sunan An-Nasa'i

It was narrated that 'Ubaidullah bin 'Abdullah said:""Umar, may Allah (SWT) be pleased with him, went out on the day of 'Eid and asked Abu Waqid Al-Laithi: 'What did the Prophet (ﷺ) recite on this day?' He said: 'Qaf' and '(The Hour) has drawn near