Read and reflect on verse 786 from Surah Al-Maaida: Nothing did I tell them beyond what Thou didst bid me [to say]: `Worship God, [who is] my Sustainer as well as your Sustainer.' And I bore witness to ...
مَا قُلْتُ لَهُمْ إِلَّا مَا أَمَرْتَنِي بِهِ أَنِ اعْبُدُوا اللَّهَ رَبِّي وَرَبَّكُمْ ۚ وَكُنْتُ عَلَيْهِمْ شَهِيدًا مَا دُمْتُ فِيهِمْ ۖ فَلَمَّا تَوَفَّيْتَنِي كُنْتَ أَنْتَ الرَّقِيبَ عَلَيْهِمْ ۚ وَأَنْتَ عَلَىٰ كُلِّ شَيْءٍ شَهِيدٌ
Nothing did I tell them beyond what Thou didst bid me [to say]: `Worship God, [who is] my Sustainer as well as your Sustainer.' And I bore witness to what they did as long as I dwelt in their midst; but since Thou hast caused me to die, Thou alone hast been their keeper: for Thou art witness unto everything.