Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 286

وَعَنْ زَيْدِ بْنِ ثَابِتٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «طُوبَى لِلشَّامِ» قُلْنَا: لِأَيٍّ ذَلِكَ يَا رَسُولَ اللَّهِ؟ قَالَ: «لِأَنَّ مَلَائِكَةَ الرَّحْمَنِ بَاسِطَةٌ أَجْنِحَتَهَا عَلَيْهَا» رَوَاهُ أَحْمد وَالتِّرْمِذِيّ

Zaid b. Thabit told that God’s messenger said, “Blessed is Syria,” and when his hearers asked him why that was, he replied, “Because the angels of the Compassionate One are spreading their wings over it.” Ahmad and Tirmidhi transmitted it.