The meaning of the one with two faces and two tongues

1. We were told by Muhammed bin Ali Majilawayh, may Allah be pleased with him, that he said: I was told by Muhammed bin Yahya al-‘Attar, that he said: We were told by Muhammed bin Hussain bin Abi’l-Khattab, from Hasan bin Ali bin Faddal, from Ali bin Nu’man, from Abdullah, bin Maskan, from Dawud bin Farqad, from Abu Shayba al-Zuhri, from Abu Ja’far, Muhammed bin Ali al-Baqir, peace be upon them both, that he said