Genesis 47:21

When Joseph had announced to Pharaoh the arrival of his relations in Goshen, he presented five out of the whole number of his brethren (אחיו מקצה; on קצה see Gen 19:4) to the king.

In this chapter we have instances, I. Of Joseph's kindness and affection to his relations, presenting his brethren first and then his father to Pharaoh (Gen 47:1-10), settling them in Goshen, and providing for them there (Gen 47:11, Gen 47:12), and paying his respects to his father when he sent for him (Gen 47:27-31). II. Of Joseph's justice between prince and people in a very critical affair, selling Pharaoh's corn to his subjects with reasonable profits to Pharaoh, and yet without any wrong to them (Gen 47:13, etc.). Thus he approved himself wise and good, both in his private and in his public capacity.

47:21 he made them all slaves: In Hebrew script, the difference is very slight between slaves (Hebrew ‘abadim) and towns (Hebrew ‘arim). Moving the people into the towns doesn’t fit the context very well, so most translations select slaves as the reading that makes the most sense (cp. 47:20).