Abdullah bin Dinar said: I heard Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) reciting: «﴿يَا أَيُّهَا النَّبِيُّ إِذَا طَلَّقْتُمُ النِّسَاءَ فَطَلِّقُوهُنَّ لِعِدَّتِهِنَّ﴾ [الطلاق: 1] » "O Prophet! When you divorce women, then divorce them at the commencement of their waiting period (iddah)."
Imam Malik (may Allah have mercy on him) said: Its meaning is that one should give one divorce in each period of purity (tuhr).