Genesis 30:18
And Leah said, God has given me my reward, because I have given my maiden to my husband: and she called his name Issachar.
Genesis 35:23
The sons of Leah; Reuben, Jacob's firstborn, and Simeon, and Levi, and Judah, and Issachar, and Zebulun:
Genesis 46:13
And the sons of Issachar; Tola, and Puvah, and Iob, and Shimron.
Genesis 49:14-15
Issachar is a strong donkey crouching down between two burdens:
Deuteronomy 33:18
And of Zebulun he said, Rejoice, Zebulun, in your going out; and, Issachar, in your tents.
1 Chronicles 12:32
And of the children of Issachar, who were men that had understanding of the times, to know what Israel ought to do; the heads of them were two hundred; and all their brethren were under their command.