Yeshayah 35:3-4

Make ye the weak hands chazak (strong), and steady the birkayim (knees) koshlot (feeble ones [knees] that give way, i.e., of those of the Golus returning to G-d in Tziyon). Say to them that are of a fearful lev, Be strong, fear not; hinei, Eloheichem (your G-d) will come with nakam (vengeance), with Elohim gemul (divine retribution) He will come and save you.