Rashi on Isaiah
in drought Heb. בְּצַחְצָחוֹת, at the time of thirst and drought. So did Jonathan render.
Ibn Ezra on Isaiah
And the Lord shall guide thee continually. He will be with thee, wherever thou goest.
Rashi on Isaiah
strengthen Heb. יַחֲלִיף [lit. arm.] Comp. (Num. 31:5) “Armed (חֲלוּצֵי) for war.”