Psalm 136 Mar. 17  1Give thanks to Yahweh, for He is good; for His grace endures forever. 2Give thanks to the God of gods; for His grace endures forever. 3Give thanks to the Lord of lords; for His grace endures forever: 4to Him who alone does great wonders; for His grace endures forever: 5to Him who by understanding made the heavens; for His grace endures forever: 6to Him who spread out the earth above the waters; for His grace endures forever: 7to Him who made the great lights; for His grace endures forever: 8the sun to rule by day; for His grace endures forever; 9the moon and stars to rule by night; for His grace endures forever: 10to Him who struck down the Egyptian firstborn; for His grace endures forever; 11and brought out Israel from among them; for His grace endures forever; 12with a strong hand, and with an outstretched arm; for His grace endures forever: 13to Him who divided the Red Sea apart; for His grace endures forever; 14and made Israel to pass through its midst; for His grace endures forever; 15but overthrew Pharaoh and His army in the Red Sea; for His grace endures forever: 16to Him who led His people through the wilderness; for His grace endures forever: 17to Him who struck great kings; for His grace endures forever; 18and killed mighty kings; for His grace endures forever: 19Sihon king of the Amorites; for His grace endures forever; 20Og king of Bashan; for His grace endures forever; 21and gave their land as an inheritance; for His grace endures forever; 22even a heritage to Israel His servant; for His grace endures forever: 23who remembered us in our low estate; for His grace endures forever; 24and has delivered us from our adversaries; for His grace endures forever: 25who gives food to every creature; for His grace endures forever. 26Oh give thanks to the God of heaven; for His grace endures forever.   

Commentary

136:8 In this hard and graceless world, we have only to look at the sun and moon, indeed at all of creation, to see God’s sensitive grace constantly active.
136:10 The death of the Egyptian firstborn and their army (:15) was a reflection of God’s grace to Israel. We may struggle with this but ultimately it is a challenge to our perceptions and understanding rather than any bad reflection against God (see 143:12). We are reminded of how the flood was brought to destroy the world of Noah’s day in order to save him (2 Pet. 2:5) so that he was as it were saved by that water just as the water of baptism saves us (1 Pet. 3:19-21). 
136:23,24 Understood by Mary as having fulfilment in the birth of Christ as our ultimate deliverer (Lk. 1:48).