Abu Dawud Book 2, Hadith Number 1275.

Chapter : The view that the praying of the two rakahs after the afternoon prayer is permissible when the sun is at its height.

Narated By ‘Aisha, Ummul Mu’minin : Dhakwan, the client of ‘Aisha, reported on the authority of ‘Aisha: The Apostle of Allah (PBUH) used to pray after the afternoon prayer but prohibited others from it; and he would fast continuously but forbid others to do so.