Al-Baqarah 2:69

Qaloo odAAu lana rabbakayubayyin lana ma lawnuha qala innahuyaqoolu innaha baqaratun safrao faqiAAunlawnuha tasurru annathireen

They said, "Call upon your Lord to show us what is her color." He said, "He says, 'It is a yellow cow, bright in color - pleasing to the observers.'"

They said, “Pray for us to your Lord that He makes it clear to us of what colour it should be.” He said: “He says that she should be a yellow cow, rich yellow in her colour that should please the onlookers.”