"Do you covet that they would believe you?" He says: This is addressed to the Prophet, peace and blessings be upon him, and to the believers, asking if they would believe you; meaning: the group of the Jews; because the elite among them might follow his religion, "and indeed a party of them were..."
﴿أفتطمعون أَن يُؤمنُوا لكم﴾ يَقُولُ: هَذَا للنَّبِي ﷺ وَلِلْمُؤْمنِينَ أَن يصدقوكم؛ يَعْنِي: جمَاعَة الْيَهُود؛ لِأَن الْخَاصَّة قد تتبع مِلَّته (وَقَدْ كَانَ فَرِيقٌ