The Permissible Lying

source: silsilat ul-ahādīth us-sahīha ~ the series of authentic narrations ~ hadīth no. 545
Umm Kulthūm bint ʽUqbah said: “the Prophet (صلى الله عليه وسلم) allowed lying in three (situations): during war, in reconciling between people, and the speech of a man to his wife. {In another narration:} the speech of a man to his wife and the speech of a woman to her husband.”
Shaykh al-Albānī comments:[1]
“I say, it is not part of the permissible lying that (the man) promises (his wife) something that he does not intend to fulfill for her, or he tells her that he bought such and such thing for her with such and such price – i.e., more than the real (price) – for the purpose of pleasing her, because that may be revealed to her; then it will be a reason for her to think badly of her husband, and that is part of corruption, not rectification.”

~ asaheeha translations ~

[1] this commentary was taken from Silsilat ul-Ahādīth us-Sahīha #498