Ps 149,5 can be understood from the literary motif of intensified spiritual activity and receptivity in resting time, particularly in the night. Formally, the statement of this verse is related to Cant 3,1. In vv. 5-9 the psalm describes the feelings and
mental images of YHWH’s faithful with regard to a future judgement on the nations. The consciousness of Israel’s special position, expressed in the preceding hallelujah-psalms as well, is brought to a climax.
The motive of joy in suffering for Jesus' sake, makes the last beatitude in Matt 5,11-12 and Luke 6,22-23 different from the former blessings. The persecution form present in this beatitude seems to be an authentic saying of Jesus, subsequently widespread in NT literature. Such a motive, in fact, does not appear in Judaism and in intertestamental or in apocryphal literature. The First Letter of Peter is instead a special witness of 'joy in suffering'.