Neh 12:31

“upon the wall meaning that he sanctified the city, the princes, the tribunal, and the Levites with two thanksgiving offerings around the city, as is delineated in Tractate Shebuoth (14a, 15a, b), in order to sanctify the city. two...thanksgiving offerings two breads of the thanksgiving offerings, each bread being called a thanksgiving offering. with processions to the right And when they went out of the city in order to encompass it, they went to the right side.”

“Then I brought up the princes - Perhaps this verse should be read thus: "Then I caused the princes of Judah to go upon the wall, and appointed two great choirs, [to sing praises], and two processions, one on the right hand, etc. The following seems to have been the order of the procession: he divided the priests, the Levites, the magistrates, and the people into two companies; each company to go round one half of the wall. They began at the dung gate, one party going to the right and the other to the left, till they met at the great space opposite to the temple, where they all offered many sacrifices to God, and rejoiced with exceeding great joy; shouting so that the noise was heard a great way off.”

“Choirs. This is not expressed in Hebrew and Septuagint, but must be understood. Protestants, “great companies of them that gave thanks. Whereof one went.” (Haydock) — The princes led the way, then the priests sounded the trumpets, (Numbers x. 8.) the Levites sung, and were followed by the people. All were divided into two equal parts, and went round half the city. (Calmet) — They set out from the dunghill-gate, on the west, and proceeded to the watch-gate, on the east, ver. 38. (Menochius)”