Sunan an Nasai
1567
Sahih+2

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

SahihAbu Ghuddah
SahihAl-Albani