faqih-3208Vol. 2, p. 618
حَقُّ اللَّهِ الْأَكْبَرُ[3] عَلَيْكَ أَنْ تَعْبُدَهُ وَ لَا تُشْرِكَ بِهِ شَيْئاً فَإِذَا فَعَلْتَ ذَلِكَ
"The greatest right of Allah (swt) upon you is that you worship Him and do not associate anything with Him. If you fulfill this with sincerity, He has taken it upon Himself to suffice for your worldly and afterlife matters. The right of your self upon you is that you employ it in obedience to Allah (swt), the Mighty an