Narrated Ibn `Abbas:The Prophet (ﷺ) said, "No man should stay with a lady in seclusion except in the presence of a Dhu-Mahram." A man stood up and said, "O Allah's Messenger (ﷺ)! My wife has gone out intending to perform the Hajj and I have been enrolled (in the army) for such-and-such campaign." The Prophet (ﷺ) said, "Return and perform the Hajj with your wife
Hadith No. 5233
Sahih al Bukhari