The story of the Children of Israel and the cow 2:67-71
2:67 When Moses said to his nation, 'Allah commands you to slaughter a cow,' they replied, 'Are you taking us in mockery?' 'I seek protection with Allah lest I should be one of the ignorant' he said.
2:68 'Call on your Lord,' they said, 'to make known to us what she shall be.' He said, "He says she is a cow neither old, nor virgin, middling between both." Therefore, do as you have been ordered.'
2:69 'Call on your Lord,' they said, 'to make known to us what her color shall be.' 'Your Lord says, "The cow is yellow, a rich yellow pleasing to the onlookers."'
2:71 He replied, 'He says, "She is a cow, neither worn out plowing the earth nor watering the field, one kept secure free from any blemish."' 'Now you have brought us the truth, 'they answered. And they slaughtered her, after they had been reluctant to do so.