Eqev (H6118) shares its root with Jacob's name (Ya'aqov β heel-grabber). As a noun it means heel; as a conjunction it means 'because of' or 'as a result of' β pointing to consequence and reward. Psalm 19:11 and 119:112 use it for the great reward of keeping God's commands.
The theological arc of eqev is profound: from Jacob grasping the heel of Esau (cunning ambition), to God's promise that the seed of the woman would crush the serpent's head while the serpent would strike his heel (Genesis 3:15). But eqev also points forward to reward: there is a great eqev β consequence, payoff β for those who walk in God's ways. What we do has lasting weight.