However...
However, after peace there is great apprehension from the enemy because often the enemy offers peace to benefit by your negligence. Therefore be cautious and do not act by wishfulness in this matter.
If you conclude an agreement between yourself and your enemy or enter into a pledge with him, then fulfill your agreement and discharge your pledge faithfully, next yourself as a shield against whatever you have pledged because among the obligations of Allah there is nothing on which people are more strongly united despite the difference of their ideas and variation of their views than respect for fulfilling the pledges.
Besides Muslims even unbelievers have abided by the agreements because they realized the dangers to come in the wake of violation (there of). Therefore do not deceive your enemy, because no one can offend against Allah save the ignorant and the wicked. Allah made agreement and pledge the sign of security which He has spread over his creatures through His mercy and an asylum in which they stay in His protection and seek benefit of His neighborhood.
Therefore there should be no deceit, cunning or duplicity in it. Do not enter into an agreement that may admit different interpretations and do not change the interpretation of vague words after the conclusion and confirmation (of the agreement).
If an agreement of Allah involves you in hardship do not seek its repudiation without justification, because bearing of hardships through which you expect relief and handsome result is better than violation whose consequence you fear, and you apprehend that you will be called upon by Allah to account for it and you will be unable to seek forgiveness for it in this world or the next." I (i.e., the author) say: If we return to our subject, we will see that the stipulations which al-Hasan b.
'Ali, peace be on him, imposed on Mu'awiya in the Peace Treaty were certain pledges and strong oaths which history had never witnessed before. Moreover, Mu'awiya himself had written their final copy with his pen and stamped them with his stamp.
Therefore no wonder when the Islamic public opinion at that time looked forward to fulfilling these conditions because they were obligatory according to these pledges and oaths, and because their fulfillment would be appropriate for two figures of such kind in Islam. As for that strange surprise which Mu'awiya started within a week after concluding the Peace Treaty, it shook the Muslim society.