Aliya Summary: Moshe and Aaron went to Pharaoh and presented G‑d’s demand. Pharaoh mocked the request and instructed the Egyptian taskmasters to increase the Israelite slaves’ workload. The Israelites were unable to meet Pharaoh’s new demands, and were viciously beaten as a result. Moshe addressed G‑d: “Why have You mistreated this people? Why have You sent me? Since I have come to Pharaoh to speak in Your name, he has mistreated this people, and You have not saved Your people.” G‑d responded: “Now you will see what I will do to Pharaoh, for with a mighty hand he will send them out…”
“And afterwards, Moshe and Aharon go” to Paroh and say to him “Let my People go…”. Notice that the elders are not mentioned. Rashi tells us that one by one the elders “disappeared” (in fear of Paroh) as the entourage was headed towards Paroh, until only Moshe and Aharon were left. As a result, so it was to be at Sinai: The elders were left at the foot of the mountain and Aharon and Moshe ascended.