It is narrated from a Ghifari companion (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever does not remove the hair below his navel, does not trim his nails, and does not cut his mustache, then he is not from among us.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 23480
Hadith Gradingحکم دارالسلام:حسن لغيره، وهذا إسناد ضعيف من أجل ابن لهيعة