A hexagram on a lintel at Salah El-Din citadel in Sadr, Sinai, was defaced and the name Allah was chiseled instead- reported Tareq M.G. Abdel Hamid in his Unpublished M.A. Thesis, The American University in Cairo, 2005.
From: Islamic history through coins: an analysis and catalogue of tenth-century Ikhshidid coinage by Jere L. Bacharach, American Univ. in Cairo Press , 2006
ISBN 9774249305 p. 160