The sad predicament of Moses on this occasion is partly traceable to the fact that he had to face alone the murmurs and complaints of the people without the accustomed assistance of the seventy elders. Since the exodus from Egypt the seventy elders of the people had always been at his side, but these had recently been killed by the fire from heaven at Taberah, so that he now stood all alone. This death overtook the elders because like Nadab and Abihu they had not shown sufficient reverence in ascending Mount Sinai on the day of the revelation, when, in view of the Divine vision, they conducted themselves in an unseemly manner.
Like Nadab and Abihu the elder would have received instantaneous punishment for their offense, had not God been unwilling to spoil the joyful day of the revelation by their death. But they had to pay the penalty nevertheless: Nadab and Abihu, by being burned at the consecration of the Tabernacle, and the elders similarly, at Taberah.