And [recall] when Moses said to his people, "Indeed, Allah commands you to slaughter a cow." They said, "Do you take us in ridicule?" He said, "I seek refuge in Allah from being among the ignorant."
They said, "Call upon your Lord to make clear to us what it is." [Moses] said, "[ Allah ] says, 'It is a cow which is neither old nor virgin, but median between that,' so do what you are commanded."
He said, "He says, 'It is a cow neither trained to plow the earth nor to irrigate the field, one free from fault with no spot upon her.' " They said, "Now you have come with the truth." So they slaughtered her, but they could hardly do it.