Hadith 8:390
Abu Bakr narrated to us, he said: Ibn ‘Uyaynah narrated to us, from Muhammad ibn al-Munkadir, from Yusuf ibn Salam, that he heard a man from the Ansar saying: Indeed, the Messenger of Allah (may Allah bless him and grant him peace) said to him and to his wife: "Perform Umrah in Ramadan, for an Umrah for you both in Ramadan is equivalent to a Hajj."
حدثنا أبو بكر قال ثنا بن عيينة عن محمد بن المنكدر عن يوسف بن سلام سمع رجلا من الأنصار يقول إن رسول الله صلى الله عليه وسلم قال له ولامرأته اعتمرا في رمضان فإن عمرة لكما في رمضان تعدل حجة