וַיָּבֹאוּ֮ אֶל־מַחֲנֵ֣ה יִשְׂרָאֵל֒ וַיָּקֻ֤מוּ יִשְׂרָאֵל֙ וַיַּכּ֣וּ אֶת־מוֹאָ֔ב וַיָּנֻ֖סוּ מִפְּנֵיהֶ֑ם ויבו־[וַיַּכּוּ־] בָ֔הּ וְהַכּ֖וֹת אֶת־מוֹאָֽב׃
Mas cuando llegaron al campo de Israel, levantáronse los Israelitas é hirieron á los de Moab, los cuales huyeron delante de ellos: siguieron empero hiriendo todavía á los de Moab.
Rashi
והותר is an infinitive similar to, (Exodus 8:11) “[But when Pharaoh saw that there was respite] he allowed his heart to be hardened (והכבד)”; (2 Kings 3:24) “and they smote (והכות) Moab” (infinitives used in perfect sense).
Rashi
והכבד את לבו HE ALLOWED HIS HEART TO BE HARDENED — The word הַכְבֵּד expresses doing something (the Hebrew infinitive but having a past meaning) just as, (Genesis 12:9) “going (הלוך) and journeying (ונסוע)”. So, too, (2 Kings 3:24) “and smiting (והכת) Moab”; (I Samuel 22:13) “and enquiring (ושאול) of God for him”; (1 Kings 20:37); “smiting (הכה) and wounding (ופצוע)”.
Rashi
והקל 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.