To slip here means to waver, wobble, become lame, bend, and make to shake. Envy is synonymous with jealousy.
Asaph was troubled and lame until he sought the Lord for understanding. He decided to enter the sanctuary of God and, in God’s presence, he was set free from his envy and slippery imprisonment. He also discovered that it was actually the prospering of the wicked that God would set in slippery places and destruction.
Like Asaph, have you been envious and jealous toward someone, past or present? If so, get into God’s presence through Christ Jesus and ask Him to forgive you and emancipate you from this terrible prison of sin. Avoid envy by making sure your steps hold fast to God’s paths so that your feet will not slip. See Psalm 17:5.
Finally, be mindful of this: “A tranquil heart is life to the body, but passion (envy) is rottenness to the bones.” (Proverbs 14:30)