(Exodus, Ibid.) "Stand ready (hithyatzvu) to see the salvation of the L–rd": Moses said to them: Today the Shechinah will repose the Holy Spirit upon you; for "yetzivah" in all places refers to the Holy Spirit, viz. (Amos 9:1) "I saw the L–rd nitzav on the altar", and (I Samuel 3:10): "And the L–rd came vayithyatzev, and He called as before 'Samuel, Samuel'", and (Devarim 31:14) "Call Joshua vehithyatzvu in the tent of meeting and I will command him", and (Exodus 2:4) "Vatethatzav his sister from afar to know what would be done with him," the Holy Spirit reposing itself upon her.
Stand Ready Hithyatzvu to See the Salvation
Mekhilta Tractate Vayehi Beshalach 3:19