Numbers 9:19

19.Then the children kept the charge of the Lord. Some, (4) in my opinion, extend this too far, thinking that when the cloud tarried, the children of Israel, being as it were at leisure, employed themselves in the worship of God; but I restrict it rather to that heedfulness which is then praised at some length. To keep the charge (custodiam,) then, is equivalent to regarding the will of God with the greatest earnestness and care. For, when the cloud had begun to rest in any place, the people knew that they were to remain there; but if on the next day they were not attentive, the cloud might vanish, and thus their neglect and carelessness might deprive them of this incomparable advantage.

To this end it is said immediately afterwards that, If for one day, or more, or even for a month, or a year, the cloud stood still, the people was, as it were, tied to the spot. The old interpreter (5) has not badly rendered it, “The children of Israel were upon the watch;” since day and night they anxiously expected the time when God would command them to move forward. The last verse of the chapter confirms this sense, where it is again added, that “they kept the charge of the Lord at His mouth by the hand of Moses:” whence it appears that Moses was God’s interpreter, so that they might set forth on their march whenever the cloud being lifted up pointed out to them the way. Nor can it be doubted but that it preceded them; so that they might know in what direction God would have them proceed, and whither they were to go. Moreover, it must be observed that in both respects it is counted worthy of praise in the people, that they should either journey, or continue where they were, at God’s command. Thus is that absurd activity condemned which engages itself in endless work; as if men could only obey God by turmoil. Whereas it is sometimes no less a virtue to rest, when it so pleases God. (6)