Kitāb al-Zuhd

Hadith 144
angels
الحسين بن علوان عن عمرو بن شمر عن جابر عن أبي جعفر عليه السلام قال: سألته عن موضع الملكين من الانسان قال: هاهنا واحد وهاهنا واحد يعنى عند شدقيه.
2.Al-Ḥusayn ibn ʿUlwān narrated from ʿAmr ibn Shimr, from Jābir, from Abū Jaʿfar (a) saying, “I (Jābir) asked him (the Imam) about the position of the two angels in relation to the human being, so he said, ‘One is here and the other is here,’ meaning on the two sides of his mouth.”
Source: Ḥusayn b. Saʿīd al-Ahwāzī