The Last Supper had ended, and Jesus and the disciples did what was customary to do at the conclusion of the Passover: they sang a group of hymns (Psalms 113-118) which were called the Hallell (meaning “praise” in Hebrew).
We consider how interesting it is that Jesus would do this, in view of what those Psalms say regarding His work, and because of what He was about to face; He was about to be offered up for His people. Yet even in the midst of this coming distress, Jesus was singing praise to God.
Applying this to ourselves, we are encouraged to praise God in all circumstances, seeing that He always brings good from even the afflictions of His children. We also see, though, that all the promises of blessings from the Lord are only for those who have put their trust in Him for salvation.