Al-Kāfi - Volume 1 > Chapter on al-Ruh, the Spirit
Hadith #2

2ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنِ الْحَجَّالِ عَنْ ثَعْلَبَةَ عَنْ حُمْرَانَ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ السَّلام) عَنْ قَوْلِ الله عَزَّ وَجَلَّ وَرُوحٌ مِنْهُ قَالَ هِيَ رُوحُ الله مَخْلُوقَةٌ خَلَقَهَا الله فِي آدَمَ وَعِيسَى.

2. It is narrated from a number of our people from Ahmad ibn Muhammad ibn ‘Isa from al-Hajjal from Tha‘laba from Himran who has said the following. “I asked Imam abu ‘Abdallah (a.s.) about the words of Allah, the Most Holy, the Most High, ‘The spirit from Him’. Imam abu ‘Abdallah (a.s.) replied, “It is the spirit (Ruh) from Allah created in Adam and Jesus.”