God listened to Leah, and she conceived and bore Jacob a fifth son. Leah said, “God has rewarded me for giving my slave to my husband,” and she named him Issachar. (Genesis 30:17-18)
Issachar sounds like the Hebrew word for “reward” or “wages.”
It’s highly doubtful that God was rewarding Leah for giving her slave to Jacob to sleep with. But the problem with sin is that it deceives us into thinking that it’s giving us something good. It may even claim God is the one giving you the good.
How much better to receive the free gift of God that comes through Jesus.
For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord. (Romans 6:23)
Moment to Moment (Bible blog) 