Musannaf Ibn Abi Shaybah 6090 — The four rakahs before Zuhr: are they

Abd al-Rahman bin Budayl said: The person best acquainted with the affairs of Sayyiduna Abdullah (may Allah be pleased with him) told me that, after the sun had passed the meridian, he used to offer four long rak'ahs in his house; then, when the muezzins called the adhan, he would come out and sit in the mosque until the prayer was started.