Sunan an Nasai
2871
Sahih+2

It was narrated that Ibn Abbas said:"The Messenger of Allah came on the fourth day of Dhul-Hijjah having entered Ihram for Hajj. He prayed Subh in Al-Batha and said: 'Whoever wants to make it Umrah, let him do so

SahihAbu Ghuddah
SahihAl-Albani