It is narrated from Hazrat Aisha (may Allah be pleased with her) that I heard the Prophet (peace and blessings be upon him) say: Whoever points a sharp-edged weapon at a Muslim with the intention of killing him, then it is permissible to kill him.
Hadith Referenceمسند احمد / مسند النساء / 26294
Hadith Gradingحکم دارالسلام:إسناده ضعيف لتفرد أم علقمة