2:68
قَالُواْ ادْعُ لَنَا رَبَّكَ يُبَيِّن لّنَا مَا هِيَ قَالَ إِنَّهُ يَقُولُ إِنَّهَا بَقَرَةٌ لاَّ فَارِضٌ وَلاَ بِكْرٌ عَوَانٌ بَيْنَ ذَلِكَ فَافْعَلُواْ مَا تُؤْمَرونَ
They said: "Beseech on our behalf Thy Lord to make plain to us what (heifer) it is!" He said; "He says: The heifer should be neither too old nor too young, but of middling age. Now do what ye are commanded!"
66:5
عَسَى رَبُّهُ إِن طَلَّقَكُنَّ أَن يُبْدِلَهُ أَزْوَاجاً خَيْراً مِّنكُنَّ مُسْلِمَاتٍ مُّؤْمِنَاتٍ قَانِتَاتٍ تَائِبَاتٍ عَابِدَاتٍ سَائِحَاتٍ ثَيِّبَاتٍ وَأَبْكَاراً
It may be, if he divorced you (all), that Allah will give him in exchange consorts better than you,- who submit (their wills), who believe, who are devout, who turn to Allah in repentance, who worship (in humility), who travel (for Faith) and fast,- previously married or virgins.