﴿ قَالُوا۟ ٱدْعُ لَنَا رَبَّكَ يُبَيِّن لَّنَا مَا هِىَ ۚ قَالَ إِنَّهُۥ يَقُولُ إِنَّهَا بَقَرَةٌۭ لَّا فَارِضٌۭ وَلَا بِكْرٌ عَوَانٌۢ بَيْنَ ذَٰلِكَ ۖ فَٱفْعَلُوا۟ مَا تُؤْمَرُونَ ﴾

“Said they: "Pray on our behalf unto thy Sustainer that He make clear to us what she is to be like." [Moses] replied: "Behold, He says it is to be a cow neither old nor immature, but of art age in-between. Do, then, what you have been bidden!"”

Please check ayah 2:71 for complete tafsir.