משנה אויף תהילים 91:15

The mitzvah of the aravah how was it [performed]?There was a place below Jerusalem called Moza. They went down there and gathered tall branches of aravot and then they came and stood them up at the sides of the altar, and their tops were bent over the altar. They then sounded a teki’ah [long blast], a teru’ah [staccato blast] and again a teki’ah. Every day they went round the altar once, saying, “O Lord, save us, O Lord, make us prosper” (Psalms 118:. Rabbi Judah says: “Ani vaho, save us.” On that day they went round the altar seven times. When they departed, what did they say? “O altar, beauty is to you! O altar, beauty is to you!” Rabbi Eliezer said: [they would say,] “To the Lord and to you, O altar, to the Lord and to you, O altar.”