Answer:
(Fatwa: 1023/1023/M=1432)
If you could maintain equality between the two wives in paying their rights, you can do second marriage.
فَانكِحُواْ مَا طَابَ لَكُم مِّنَ النِّسَاء مَثْنَى وَثُلاَثَ وَرُبَاعَ [النساء: 3]
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
