From an usused root meaning to gleam; a flash; figuratively, a sharply polished blade or point of a weapon -- blade, bright, flame, glittering.
H3851. lahab
לַ֫הַב noun masculine flame, blade; — ׳ל absolute Judges 3:22, 22 2t.; construct 13:20 5t.; plural לְהָבִים Isaiah 13:8; construct לַהֲבֵי 66:15; —
1 flame of altar, Judges 13:20 (twice in verse) ׳(ל הַמִּזְבֵּחַׅ) ׳ל אוֺכְלָה אֵשׁ, of ׳יs is judgement Isaiah 29:6; 30:30; 66:15 (in all "" forces of nature, whirlwind, thunder, earthquake, rain, hail, etc.); figurative ל ׳מְּנֵי מְּנֵיהֶם 13:8 (i.e. hot with excitement, compare Di); simile Joel 2:5 ל ׳כְּקוֺל אֵשׁ (of rush of locusts); figurative of breath of crocodile Job 41:13.
2 of flashing point of spear Job 39:23; blade of sword Nahum 3:3; in prose, Judges 3:22 (twice in verse).