Blow up the trumpet in the new moon, in the time appointed, on our solemn feast day. Blow up the trumpet in the new moon - i:e., on the first of the month, in order to prepare for the celebration of the Passover on the 14th of the month Nisan (Maurer). But Hengstenberg better translates, 'Blow the horn in the month' - i:e., the first and chief month of the year; that in which the Passover occurred (Exodus 12:1-2, "This month shall be unto you the beginning of months: it shall be the first month of the year to you;" Leviticus 23:5; Abib, Exodus 13:4; Deuteronomy 16:1). The Hebrew throughout the Pentateuch means the month, not the new moon х chodesh (H2320)]. In the later Scriptures sometimes the month stands for the festival special to the month; otherwise it signifies month.
In the time appointed. The Hebrew х keceh (H3677), from kaasaah (H3780), fat or full] is rather, 'at the full moon,' as it ought to be translated also in Proverbs 7:20. The contents of the psalm shows that it was composed exclusively for the Passover (Psalms 81:5-7; Psalms 81:10). The horn-the instrument here (not the trumpets named in Numbers 10:10, blown in the beginnings of months) - is only one among many instruments; while the sounder drums for the new moons was the characteristic ceremony. Music and singing formed an important part in the celebration of the Passover (2 Chronicles 30:21).
On our solemn feast day. The Passover was the most solemn feast of Israel, celebrating, as it did, the fundamental event in their history-their deliverance out of Egypt by God.