Judg 16:17

וַיַּגֶּד־לָ֣הּ אֶת־כָּל־לִבּ֗וֹ וַיֹּ֤אמֶר לָהּ֙ מוֹרָה֙ לֹֽא־עָלָ֣ה עַל־רֹאשִׁ֔י כִּֽי־נְזִ֧יר אֱלֹהִ֛ים אֲנִ֖י מִבֶּ֣טֶן אִמִּ֑י אִם־גֻּלַּ֨חְתִּי֙ וְסָ֣ר מִמֶּ֣נִּי כֹחִ֔י וְחָלִ֥יתִי וְהָיִ֖יתִי כְּכָל־הָאָדָֽם׃

Samson told her all that was in his heart: “My hair has never been cut, because I have been a Nazirite to God from my mother’s womb. If I am shaved, my strength will leave me, and I will become as weak as any other man.”