The Messenger of Allah ﷺ said, "An Umrah performed in Ramadan equals a Hajj."
حدثنا وكيع حدثنا داود الزعافري عن الشعبي
قال رسول الله ﷺ عمرة في رمضان تعدل حجة
Its isnad is sahih. Dawud Zaafari is Ibn Abdullah Awdi, and he is trustworthy, as mentioned previously, and his hadith is found in the Four (Sunan collections). The hadith has already appeared at 15206.