Halakha Mazmur 89:38: Arukh HaShulchan

And after this we are accustomed to say "Blessed is the One Who formed you" -- as a sign for Ya'akov. And some begin "Blessed is the One Who made you", due to the order of the words. And dance three times opposite it with toes [i.e. jump], and say "Just as I... Fall...", and [the latter formula] backwards three times [each]. And we are accustomed to say "David, King of Israel, lives and endures", and the intent is the descendants of David. For the kingship of the house of David is compared to the moon, as it is written in Psalms (89:37-8) "His line continues forever... as the moon established forever." As if to say -- even though it gets dark, it will get light again. And after that we say each to the other "Peace be upon you..." "The voice of my beloved..." "My beloved is similar..." "A song of ascents..." "Praise God from Their Sanctuary..." "It is taught in the house of Rabbi Yishmael, if..." and "May it be Your will", as it is written in prayerbooks. And our teacher the Rem"a [Rabbi Moshe Isserles] writes: "we are accustomed to say "David..." for his kingship is compared to the moon, and is destined to renew itself like one. And the community of Israel will return to cleave unto the Holy Blessed One and their example is the moon which renews itself with the sun, as it says "the sun and the shield of God..." (Psalms 84:12). And therefore we do joys [?] and dances at the sanctification of the moon: an example of the joy of a wedding." This is the end of the Rem"a's language. And the primary portion is the blessing, and [the lack of it] prevents [it working], and the other things, if one didn't say them -- it's not prevented. (And one shakes the folds of one's clothes.)