"So remain on a right course as you have been commanded," meaning: in Islam, "and those who have turned back with you," meaning: the believers who have repented from polytheism, "and do not transgress," meaning: do not turn back from Islam.
﴿فاستقم كَمَا أمرت﴾ عَلَى الإِسْلامِ ﴿وَمَنْ تَابَ مَعَكَ﴾ يَعْنِي: الْمُؤْمِنِينَ الَّذِينَ تَابُوا مِنَ الشّرك ﴿وَلَا تطغوا﴾ فترجعوا عَن الْإِسْلَام.