Wama lakum la tu'minoona billahi warrasoolu yadAAookum litu'minoo birabbikum waqad akhatha meethaqakum (surah Hadid: 8)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(57:8) How is it that you do not believe in Allah when the Messenger calls you to believe in your Lord *11 and although he has taken a covenant from you, *12 if indeed you are believers?

Wa maa lakum laa tu`minoona billaahi war Rasoolu yad`ookum lituu`minoo bi Rabbikum wa qad akhaza meesaaqakum in kuntum mu`mineen

*11) That is, "You are adopting this unbelieving attitude and conduct at a time when the Messenger of Allah is present among you, and you are receiving the invitation to the Faith not through an indirect and remote means but directly through the Messenger of Allah himself."
*12) Some commentators have taken this pledge to imply the pledge of service to Allah, which had been taken at the beginning of creation from the future offspring of Adam (peace be upon him), and some others take it for the pledge with which man has been naturally endowed to serve and obey Allah. But the trnth is that it implies the conscious pledge of obedience to Allah and His Messenger that every Muslim makes to his Lord by the affirmation of the Faith At another place in the Qur'an this same pledge has been referred to thus;
"Keep in mind the blessing Allah has bestowed upon you and do not forget the solemn covenant which He made with you (and which you confirmed), when you said: `We have heard and submitted.' Fear Allah for Allah knows the very secrets of the hearts," (AI-Ma'idah: 7)
Hadrat `Ubadah bin Samit relates: "The Holy Messenger of Allah (upon whom be His peace and blessings) had made us pledge that we would listen and obey both in sound health and in ill health; would spend in the cause of Allah both in prosperity and in adversity would enjoin the good and forbid the evil; would proclaim the truth for the sake of Allah and would not fear the blame of any one in this regard." (Musnad Ahmad)