مَا أَنْتُمَا بِأَقْوَى مِنِّي
“You two are not stronger than I am.”
مَا negates the statement; أَنْتُمَا addresses two people. أَقْوَى expresses comparison in strength, while مِنِّي means “than I.” The sentence does not disparage the companions' strength; it explains why the speaker should share their hardship.
مَا أَنَا بِأَغْنَى عَنِ الْأَجْرِ مِنْكُمَا
“Nor am I more independent of reward than you two.”
الأَجْر here means reward for a good deed. Both expressions show a comparison framed as a negation.