Quran 2:70 — The Heifer (Al-Baqarah)

قالُوا ادعُ لَنا رَبَّكَ يُبَيِّن لَنا ما هِىَ إِنَّ البَقَرَ تَشٰبَهَ عَلَينا وَإِنّا إِن شاءَ اللَّهُ لَمُهتَدونَ

They said, "Call upon your Lord to show us which one. The heifers look alike to us and, GOD willing, we will be guided."

[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."

[2:71] He said, "He says that she is a heifer that was never humiliated in plowing the land or watering the crops; free from any blemish." They said, "Now you have brought the truth." They finally sacrificed her, after this lengthy reluctance.