Rashi on Exodus 18:22/רש"י על שמות י״ח:כ״ב

1ושפטו — Onkelos translates this by וידונון AND LET THEM JUDGE (not “and they judged”, as in v. 26) — the word expresses a command.

2והקל מעליך lit., AND TO LIGHTEN the burden FROM OFF YOU — this thing will serve to lighten it from off you. והקל — the grammatical form is similar to (Exodus 8:11) ”and to harden (והכבד) his heart”; (2 Kings 3:24) “and to smite (והכות) Moab” — both of which words are infinitives expressing present time.