The dual noun chalatsayim refers to the loins or waist area of the human body — the region between the ribs and the hips. Biblically, 'the loins' were considered the seat of strength, vigor, and generative power. 'Coming out of the loins' means being physically descended from someone.
The loins carry profound theological symbolism throughout Scripture. 'Girding the loins' (Isaiah 11:5; Ephesians 6:14) is preparation for action — service, warfare, or spiritual readiness. God 'girds with strength' (Psalm 18:32). Descendants 'come out of the loins' of the patriarchs (Genesis 35:11; Hebrews 7:5, 10). The Passover command to eat with loins girded (Exodus 12:11) stamped the posture of readiness into Israel's corporate memory. Jesus in Revelation 1:13 is girded about the chest with a golden girdle — the priestly king ready for holy action.