مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 4422
Clothing
Combing the Hair - Section 1
وَعَن أَنس قَالَ: وُقِّتَ لَنَا فِي قَصِّ الشَّارِبِ وَتَقْلِيمِ الْأَظْفَارِ وَنَتْفِ الْإِبِطِ وَحَلْقِ الْعَانَةِ أَنْ لَا تُتْرَكَ أَكثر من أَرْبَعِينَ لَيْلَة. رَوَاهُ مُسلم
Anas said they were told not to let more than forty days elapse between the times they clipped the moustache, pared the nails, plucked out hairs under the armipits and shaved the pubes. Muslim transmitted it.
Mishkat al-Masabih, 4422صَحِيح (الألباني)