The Messenger of Allah ﷺ said, "An Umrah performed in Ramadan equals a Hajj."
حدثنا علي بن محمد حدثنا أبو معاوية عن حجاج عن عطاء
قال رسول الله ﷺ عمرة في رمضان تعدل حجة
[Sahih] Tabarani narrated it in 11/142, hadith no. 11299, from the hadith of Abu Muawiya (and others), through this route. Ibn Artah has already been mentioned, nos. 496, 1129, 2587. See also the following hadith.