al-Zukhruf

إِنَّ اللَّهَ هُوَ رَبِّي وَرَبُّكُمْ فَاعْبُدُوهُ هَذَا صِرَاطٌ مُسْتَقِيمٌ

فَاخْتَلَفَ الْأَحْزَابُ مِنْ بَيْنِهِمْ فَوَيْلٌ لِلَّذِينَ ظَلَمُوا مِنْ عَذَابِ يَوْمٍ أَلِيمٍ

64. Verily Allah! He is my Lord and your Lord. So worship Him. This is the Straight Path.
65. But the sects from among themselves differed. So woe to those who do wrong from the torment of a painful Day.

The main message of Jesus (as) is to call people to Monotheism. God, the Creator of all beings is solely worthy of worship. The blessed Verse 64 says that He is truly my Lord and your Lord. Only worship Him. It is the Straight Path which finally leads to Closeness to God Almighty. The pronoun:

is one of the Most Beautiful Divine Names whose antecedent is Allah. It refers to the Indivisible or Non-Composite (basit) Being who is Imperceptible through human senses. He is your Lord and my Lord and we are solely supposed to obey Him so that through such obedience to Him you may attain to excellence and felicity and His Infinite Mercy. Verse 65 refers to the point that following the Call of the prophets with their indubitable proofs, wise sayings, scriptures, and many a miracles each of which bear testimony to the truth of their call, woe to those who have done wrong to themselves and deserve excruciating torment for their opposition to prophetic calls.