How is it that the two selected elders did not join the others at the tabernacle? It might be that out of humility or a reluctance to take on a role fraught with responsibility, they chose to stay behind, much like Saul, who hid among the baggage when he was chosen as king (1 Sam. 10:22). Alternatively, some commentators suggest a different explanation. They propose that Moses selected six elders from each tribe, resulting in 72 individuals instead of the 70 as instructed by the Lord (Num. 11:16). Consequently, two elders were omitted from participation despite their names being recorded among the chosen. Whether this exclusion was due to their own will, Moses' decision, or by chance, they remained in the camp.
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Regardless of the reason—be it the first theory of voluntary withdrawal or the second scenario of unaccounted selection—it was the Lord's will that the Holy Spirit descend upon the two elders who stayed in the camp, just as He did with the others. Thus, inspired by the Spirit, they began to prophesy openly for all to see. Even though they were distanced from the tabernacle and from Moses, the Holy Spirit is not limited by space or separation. He is equally able to work through Moses, whether close by or far away.