Charles H. Spurgeon on Psalms 122:9

Because of the house of the Lord. The city that was the scene of so immense assemblies had necessarily a peculiar character of its own. It existed for them, it lived by them. There were priests needed for the conduct of the worship, twenty four courses of them and 20,000 men. There were Levites, their servants, in immense numbers, needed to watch, maintain, clean the temple —to do the menial and ministering work necessary to its elaborate service and stupendous acts of worship. There were scribes needed for the interpretation of the law, men skilled in the Scriptures and tradition, with names like Gamaliel, so famed for wisdom as to draw young men like Saul from distant Tarsus, or Apollos from rich Alexandria. There were synagogues, 480 of them at least, where the rabbis read and the people heard the word which God had in past times spoken unto the fathers by the prophets. The city was indeed in a sense the religion of Israel, incorporated and localized, and the man who loved the one turned daily his face toward the other, saying, "My soul longeth, yea, even fainteth for the courts of Jahveh." A. M. Fairbairn, in "Studies in the Life of Christ, "1881.