'Line' in the Bible

then his sister-in-law must approach him in view of the elders, remove his sandal from his foot, and spit in his face. She will then respond, "Thus may it be done to any man who does not maintain his brother's family line!"

How, meeting you on the way, he made an attack on you when you were tired and without strength, cutting off all the feeble ones at the end of your line; and the fear of God was not in him.

For Jehovah's portion is His people, Jacob is the line of His inheritance.