Goidel Glas was the son of Nuil, son of Fenius Farsaid, and Scota, daughter of an Egyptian Pharaoh. Goidel and his family left Egypt at the time of Moses. While in the desert, Goidel was bitten by a poisonous serpent. Desprate to save their son, Nuil and Scota brought him to Moses, who prayed to God for Goidel to be healed.

Moses' prayers were answered before Goidel could die, but the snake bite left a green mark the boy. Therefore, Goidel's name was extended to Goidel Glas. (Glas meant "green").

Moses also told Goidel Glas that his descendants would go on to live in a land without any poisonous snakes (Ireland).