'Sides' in the Bible

All Israel with their elders and officers and their judges were standing on both sides of the ark before the Levitical priests who carried the ark of the covenant of the Lord, the stranger as well as the native. Half of them stood in front of Mount Gerizim and half of them in front of Mount Ebal, just as Moses the servant of the Lord had given command at first to bless the people of Israel.

know with certainty that the Lord your God will not continue to drive these nations out from before you; but they will be a snare and a trap to you, and a whip on your sides and thorns in your eyes, until you perish from off this good land which the Lord your God has given you.