Al-Kāfi

Hadith 1044
boasting
10ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ مَحْبُوبٍ عَنْ دَاوُدَ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ مَنْ أَظْهَرَ لِلنَّاسِ مَا يُحِبُّ الله وَبَارَزَ الله بِمَا كَرِهَهُ لَقِيَ الله وَهُوَ مَاقِتٌ لَهُ.
10. Ali ibn Ibrahim has narrated from his father from ibn Mahbub from Dawud from Abu ‘Abdillah (a.s.) who has said the following: “Whoever shows off to people an act that Allah loves and opposes Allah with what He dislikes (showoff), he will find Allah at war with him.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī