6:144
And of the camels two and of the cows two. Say, "(Is it) the two males He (has) forbidden or the two females or what contains [in it] (the) wombs (of) the two females? Or were you witnesses when enjoined you Allah with this? Then who (is) more unjust than (one) who invents against Allah a lie to mislead the people without knowledge? Indeed, Allah (does) not guide the people the wrongdoing."
88:17
Then do not they look towards the camels, how they are created?