'Brethren' in the Bible

Now it came about in those days, when Moses had grown up, that he went out to his brethren and looked on their hard labors; and he saw an Egyptian beating a Hebrew, one of his brethren.

Then Moses departed and returned to Jethro his father-in-law and said to him, “Please, let me go, that I may return to my brethren who are in Egypt, and see if they are still alive.” And Jethro said to Moses, “Go in peace.”