Abd al-Aziz bin Rufay' (may Allah have mercy on him) said: I saw Abdullah bin al-Zubayr (may Allah be pleased with him) performing tawaf of the House of Allah after Fajr, and he prayed two rak'ahs.
(b) Abd al-Aziz (may Allah have mercy on him) said: I saw Abdullah bin al-Zubayr (may Allah be pleased with him) praying two rak'ahs after Asr.
(c) Aishah (may Allah be pleased with her) said: Whenever the Messenger of Allah (peace and blessings be upon him) came into my house, he would pray these two rak'ahs.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4418