وَمِن كُلِّ شَىْءٍ خَلَقْنَا زَوْجَيْنِ لَعَلَّكُمْ تَذَكَّرُونَ

Wamin kulli shay-in khalaqna zawjaynilaAAallakum tathakkaroon

And of all things We created two mates [i.e., counterparts]; perhaps you will remember.