When Moses was ordered to number among the Levites all children from a month old and upward, he said to God: "Thou biddest me count them from a month old and upward. Shall I now wander about their courts and houses and count each child, seeing that Thou givest me such a command?" But God replied: "Do thou what thou canst do, and I will do what I can do." It now came to pass that whenever Moses betook himself to a Levite tent he found the Shekinah awaiting him, tell him exactly the number of children without his having to count them.