'Chin' in the Bible
“When a man or woman has an infection on the head or chin,
the priest must examine the infection. If it appears to be deeper than the skin, and the hair in it is yellow and sparse, the priest must pronounce the person unclean. It is a scaly outbreak, a skin disease of the head or chin.
On the seventh day, he is to shave the hair on his head, chin, back, and eyebrows. After he has shaved all his hair, washed his clothes, and bathed himself with water, then he will be clean."
The ends of the hair round your face and on your chin may not be cut off.
So changing his behaviour before them, he made it seem as if he was off his head, hammering on the doors of the town, and letting the water from his mouth go down his chin.
And Joab said to Amasa, Is it well, my brother? And with his right hand he took him by the hair of his chin to give him a kiss.
And hearing this, with signs of grief and pulling out the hair of my head and my chin, I took my seat on the earth deeply troubled.
And you, son of man, take a sharp sword, using it like a haircutter's blade, and making it go over your head and the hair of your chin: and take scales for separating the hair by weight.