Quran 9:45 from Surah At-Tawba on Divine Marvels.
إِنَّمَا يَسۡتَـٔۡذِنُكَ ٱلَّذِينَ لَا يُؤۡمِنُونَ بِٱللَّهِ وَٱلۡيَوۡمِ ٱلۡأٓخِرِ وَٱرۡتَابَتۡ قُلُوبُهُمۡ فَهُمۡ فِي رَيۡبِهِمۡ يَتَرَدَّدُونَ
English translation: Only ask your leave those who (do) not believe in Allah and the Day the Last and (are in) doubts their hearts so they in their doubts they waver
Transliteration: innama yastadhinuka alladhina la yu'minuna bil-lahi wal-yawmi al-akhiri wa-ir'tabat qulubuhum fahum fi raybihim yataraddaduna