📜 Question: Is trimming one's fingernails at night haraam/forbidden or no?
📝 Answer: Trimming one's nails in the evening or in the daytime is allowed. (There is no evidence in which the noble Messenger Muhammad SallAllahu 'alaihi wa sallam prohibited the trimming of nails at night.)
From the Fataawa of sheikh AbdulAziz Ibn Baz (May Allah have mercy on him. Ameen.)
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📖 Aisha RadhiAllahu 'anha narrated: Allah's noble Messenger Muhammad SallAllahu 'alaihi wa sallam said, "Ten acts are part of natural instinct (fitra): Trimming the moustache, letting the beard grow, using the tooth-stick (brushing one's teeth), sniffing water into the nose, clipping the nails (trimming fingernails and toenails), washing the knuckles, removing hair from the underarms, shaving the pubic hair, and cleaning the private parts with water." Mus’ab said, “I forgot the tenth, except that it might be rinsing the mouth (gargling).”
Source: Sahih Muslim 261
Grade: Sahih (Authentic) according to Muslim
https://binbaz.org.sa/fatwas/1452/%D8%AD%D9%83%D9%85-%D8%AA%D9%82%D9%84%D9%8A%D9%85-%D8%A7%D9%84%D8%A7%D8%B8%D8%A7%D9%81%D8%B1-%D9%84%D9%8A%D9%84%D8%A7