Umm Kulthum bint 'Uqbah (May Allah be pleased with her) reported:
Messenger of Allah ﷺ 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 ﷺ) 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 ﷺ يقول: "ليس الكذاب الذي يصلح بين الناس فينمي خيرًا، أو يقول خيرًا" ((متفق عليه)).