Riyad as-Salihin, Book 1, Hadith 249 (In-Book) ⓘ

Umm Kulthum bint 'Uqbah (May Allah be pleased with her) reported: Messenger of Allah said, 'The person who (lies) in order to conciliate between people is not a liar, when he conveys good or says (something) good".[Al-Bukhari and Muslim].The narration in Muslim added: She said, "I never heard him (she meant the Prophet) giving permission of lying in anything except in three (things): war, conciliating between people and the conversation of man with his wife and the conversation of a woman with her husband".

وعن أم كلثوم بنت عقبة بن أبي معيط رضي الله عنها قالت سمعت رسول الله صلى الله عليه وسلم يقول‏:‏ ‏ "‏ليس الكذاب الذي يصلح بين الناس فينمي خيرًا، أو يقول خيرًا‏" ‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏