God commanded the selection of the elders to take place at the Tabernacle, that Israel might reverence them, saying, "Surely these are worthy men," but they were not permitted with Moses to enter the Tabernacle and hear God's word. The people were however mistaken in assuming that God's word reached the ears of the elders, for He spoke with Moses alone, even though the prophetic spirit came upon them also.
Now when Moses wished to proceed to the selection of the seventy elders, he was in a sore predicament because he could not evenly divide the number seventy among the twelve tribes, and was anxious to show no partiality to one tribe over another, which would lead to dissatisfaction among Israel. Bezalel, son of Uri, however, gave Moses good advice. He took seventy slips of paper on which was written "elder," and with them two blank slips, and mixed all these in an urn. Seventy-two elders, six to each tribe, now advance and each drew a slip. Those whose slips were marked "elder" were elected, while those who had drawn blank slips were rejected, but in such a wise that they could not well accuse Moses of partiality.