John Gill Commentary 1 Chronicles 9:24

"On the four sides were the porters, toward the east, west, north, and south." — 1 Chronicles 9:24 (ASV)

In four quarters were the porters
For, according to the Targum on (1 Chronicles 9:22) there were twenty four wards:

towards the east, west, north, and south ;
and, as the same paraphrase has it, six wards to the east, six to the west, six to the north, and six to the south.