"And those who strive for Us," meaning: who act for Our sake. "We will surely guide them to Our ways," meaning: the ways of guidance. "And indeed, Allah is with the doers of good," meaning: the believers.
﴿وَالَّذين جاهدوا فِينَا﴾ يَعْنِي: عَمِلُوا لَنَا. ﴿لَنَهْدِيَنَّهُمْ سُبُلَنَا﴾ يَعْنِي: سُبُلَ الْهُدَى. ﴿وَإِنَّ اللَّهَ لمع الْمُحْسِنِينَ﴾ يَعْنِي: الْمُؤْمِنِينَ