Quran 2:68 — The Heifer (Al-Baqarah)

They said, "Call upon your Lord to show us which one." He said, "He says that she is a heifer that is neither too old, nor too young; of an intermediate age. Now, carry out what you are commanded to do."

[2:67] Moses said to his people, "GOD commands you to sacrifice a heifer." They said, "Are you mocking us?" He said, "GOD forbid, that I should behave like the ignorant ones."

[2:69] They said, "Call upon your Lord to show us her color." He said, "He says that she is a yellow heifer, bright colored, pleases the beholders."