'One year I went on pilgrimage with al-Sadiq (AS). When his mount came to the place of ihram, whenever he intended to say labbayka [here I am ...] his voice would cut off in his throat, and he nearly fell off his mount. So I said to him, ?O son of the Prophet, say it, for you must say it', to which he replied, ?O Ibn Abi 'Amir, how can I dare say: 'I am here O Allah! I am here' whilst I fear lest he say, 'No labbayka and no welcome for you!'