On the evening of the fourteenth day of the month, while the Israelites were camped at Gilgal on the plains of Jericho, they kept the Passover.
10. And the children of Israel. kept the Passover, etc Here it is stated that the Passover was celebrated on the regular day, although there are some who think that the words used imply that the practice was unusual. They hence infer that, like circumcision, it had been interrupted for a period of forty years, as it would have been absurd for persons uncircumcised to...
We may well imagine that the people of Canaan were astonished, and that when they observed the motions of the enemy they could not but think them very strange. When soldiers take the field they are apt to think themselves excused from religious exercises (they have not time nor thought to attend to them), yet Joshua opens the campaign with one act of devotion after another.
Commenting on Joshua 5:10-12
And the children of Israel encamped in Gilgal,.... Not after their circumcision, but before, and where they continued encamped during that, and until the passover had been kept by them; this was little more than a mile from Jericho; see Gill on Jos 4:19, and kept the passover on the fourteenth day of the month at even; exactly as it was ordered to be observed...