What does Exodus 12:50 mean?

Moses and Aaron (Exodus 4:10–16) were the Lord's messengers to the people of Israel. They passed along God's instructions to the people (Exodus 4:29–31; 12:1, 21). When the people obeyed, it resulted in the exact outcomes which God had promised. Here, the nation of Israel once again (Exodus 12:28) follows the Lord's commands. They have just been released (Exodus 12:31–33) from slavery in Egypt (Exodus 1:11–14) and are on their way out, through Succoth (Exodus 12:37).

Moses and Aaron also relayed instructions from the Lord to powerful men such as the Egyptian king (Exodus 5:1). Pharaoh's stubborn refusal to obey God is what led to the terrible plagues (Exodus 3:19–20). This included the death of Pharaoh's own son (Exodus 11:4–6; 12:29–30).

"Moses and Aaron" are two brothers who have served together since being reunited in chapter 4. They first appeared to the elders of Israel (Exodus 4:29), then to Pharaoh (Exodus 5:1). Though initially rejected by Pharaoh and consequently scorned by the Jews, the previous nine plagues provided a new level of respect for these two men. The Jews saw Moses and Aaron as spokesmen of the Lord. They fully obeyed their commands prior to the tenth plague, showing their faith in the Lord and obedience to the God of Israel.