Tafsir of Ya seen 36:6

In order that you may warn a people whose forefathers were not warned, so they are heedless. This refers to the Arabs, for no warner had come to them before him. The fact that they alone are mentioned does not mean that others are excluded, just as mentioning some individuals does not mean that all others are excluded. We have already mentioned the Ayat and Mutawatir Hadiths which state that the mission of the Prophet is universal, when we discussed the meaning of the Ayah:

قل يا أيها الناس إني رسول الله إليكم جميعا

(Say: "O mankind! Verily, I am sent to you all as the Messenger of Allah.'') (7:158)