Quran 5:117 from Surah Al-Maaida on Divine Marvels.
مَا قُلۡتُ لَهُمۡ إِلَّا مَآ أَمَرۡتَنِي بِهِۦٓ أَنِ ٱعۡبُدُواْ ٱللَّهَ رَبِّي وَرَبَّكُمۡۚ وَكُنتُ عَلَيۡهِمۡ شَهِيدٗا مَّا دُمۡتُ فِيهِمۡۖ فَلَمَّا تَوَفَّيۡتَنِي كُنتَ أَنتَ ٱلرَّقِيبَ عَلَيۡهِمۡۚ وَأَنتَ عَلَىٰ كُلِّ شَيۡءٖ شَهِيدٌ
English translation: Not I said to them except what You commanded me [with it] that You worship Allah my Lord and your Lord And I was over them a witness that as long as I (was) among them then when You raised me You were [You] the Watcher over them and You (are) on every thing a Witness
Transliteration: ma qul'tu lahum illa ma amartani bihi ani u'budu al-laha rabbi warabbakum wakuntu alayhim shahidan ma dum'tu fihim falamma tawaffaytani kunta anta al-raqiba alayhim wa-anta ala kulli shayin shahidun