Ibn Jurayj (may Allah have mercy on him) says: I said to Ata' (may Allah have mercy on him): Did the Messenger of Allah (peace and blessings be upon him) stand leaning on a staff when he delivered the sermon? He said: Yes, he (peace and blessings be upon him) used to lean on it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5752