I visited Abu 'Abdullah [al-?adiq] (AS) whilst I had not greeted our companions in the mosque of Kufa out of extreme dissimilation (taqiyah) we were observing, so Abu 'Abdullah said to me: O Ishtaq, when did you become harsh to your brothers, you go past them and you do not greet them?! So, I said: It was because of dissimilation I was observing. He (AS) said: In dissimilation you do not refrain from greeting, but in dissimilation you try not to reveal yourself.?