Al-Adab Al-Mufrad, Book 53, Hadith 1248 (English) ⓘ
Aslam, the client of 'Umar, said, "When we came to Syria with 'Umar ibn al-Khattab, the chief came to him, 'Amir al-Mu'minin, I have prepared some food for you and I would like you to bring some nobles with you. That will be a stronger and nobler action for me.' 'Umar said, 'We cannot enter these churches of yours with the images which are inside them.'"
حَدَّثَنَا أَحْمَدُ بْنُ خَالِدٍ، قَالَ: حَدَّثَنَا مُحَمَّدُ بْنُ إِسْحَاقَ، عَنْ نَافِعٍ، عَنْ أَسْلَمَ مَوْلَى عُمَرَ قَالَ: لَمَّا قَدِمْنَا مَعَ عُمَرَ بْنِ الْخَطَّابِ الشَّامَ أَتَاهُ الدِّهْقَانُ قَالَ: يَا أَمِيرَ الْمُؤْمِنِينَ، إِنِّي قَدْ صَنَعْتُ لَكَ طَعَامًا، فَأُحِبُّ أَنْ تَأْتِيَنِي بِأَشْرَافِ مَنْ مَعَكَ، فَإِنَّهُ أَقْوَى لِي فِي عَمَلِي، وَأَشْرَفُ لِي، قَالَ: إِنَّا لاَ نَسْتَطِيعُ أَنْ نَدْخُلَ كَنَائِسَكُمْ هَذِهِ مَعَ الصُّوَرِ الَّتِي فِيهَا.
also referenced under: Hadith 1248 (Reference) & Book 53, Hadith 1248 (In-Book)