Al-Baqarah 2:68

قَالُواْ ٱدۡعُ لَنَا رَبَّكَ يُبَيِّن لَّنَا مَا هِيَۚ قَالَ إِنَّهُۥ يَقُولُ إِنَّهَا بَقَرَةٞ لَّا فَارِضٞ وَلَا بِكۡرٌ عَوَانُۢ بَيۡنَ ذَٰلِكَۖ فَٱفۡعَلُواْ مَا تُؤۡمَرُونَ 68

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