Al-Kāfi - Volume 1 > Chapter on al-Ruh, the Spirit
Hadith #4

4ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ خَالِدٍ عَنْ أَبِيهِ عَنْ عَبْدِ الله بْنِ بَحْرٍ عَنْ أَبِي أَيُّوبَ الْخَزَّازِ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ قَالَ سَأَلْتُ أَبَا جَعْفَرٍ (عَلَيْهِ السَّلام) عَمَّا يَرْوُونَ أَنَّ الله خَلَقَ آدَمَ عَلَى صُورَتِهِ فَقَالَ هِيَ صُورَةٌ مُحْدَثَةٌ مَخْلُوقَةٌ وَاصْطَفَاهَا الله وَاخْتَارَهَا عَلَى سَائِرِ الصُّوَرِ الْمُخْتَلِفَةِ فَأَضَافَهَا إِلَى نَفْسِهِ كَمَا أَضَافَ الْكَعْبَةَ إِلَى نَفْسِهِ وَالرُّوحَ إِلَى نَفْسِهِ فَقَالَ بَيْتِيَ وَنَفَخْتُ فِيهِ مِنْ رُوحِي.

4. It is narrated from a number of our people from Ahmad ibn Muhammad ibn Khalid from his father from ‘Abdallah ibn Bahr from abu Ayyub al-Khazzan from Muhammad ibn Muslim who has said the following. “I asked Imam abu ‘Abdallah (a.s.) about what people narrate that Allah created Adam in His-own form.” The Imam (a.s.) replied, “It is created and newly invented form. Allah selected and chose it over the other various forms and gave His-own possessive case just like He has done so about Ka‘bah and the spirit saying, ‘My house’ ‘I have blown My spirit in Him.’”