Sulaym ibn Amir, a man of Himyar, said: There was a peace treaty
between Muawiyah and the Byzantines, and he was going towards their
country, and when the covenant came to an end, he attacked them. A man
came on a horse, or a packhorse saying, “Allah is Most Great! Allah is
Most Great! Let there be faithfulness and not treachery!” And when they
looked they found that he was Amr ibn Abasah. Muawiyah sent for him and
questioned him (about that). He said: I heard the Messenger of Allahصلى
الله عليه وسلم say: “When one has covenant with people he must
not strengthen or loosen it till its term comes to an end or he brings
it to an end in agreement with them (to make both the parties equal).” So Muawiyah returned.
[Sunan Abu Dawud, Book 14, Number 2753]
عَنْ
سُلَيْمِ بْنِ عَامِرٍ، – رَجُلٍ مِنْ حِمْيَرَ – قَالَ كَانَ بَيْنَ
مُعَاوِيَةَ وَبَيْنَ الرُّومِ عَهْدٌ وَكَانَ يَسِيرُ نَحْوَ بِلاَدِهِمْ
حَتَّى إِذَا انْقَضَى الْعَهْدُ غَزَاهُمْ فَجَاءَ رَجُلٌ عَلَى فَرَسٍ
أَوْ بِرْذَوْنٍ وَهُوَ يَقُولُ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ وَفَاءٌ
لاَ غَدْرٌ فَنَظَرُوا فَإِذَا عَمْرُو بْنُ عَبَسَةَ فَأَرْسَلَ إِلَيْهِ
مُعَاوِيَةُ فَسَأَلَهُ فَقَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه
وسلم يَقُولُ مَنْ كَانَ بَيْنَهُ وَبَيْنَ قَوْمٍ عَهْدٌ فَلاَ
يَشُدُّ عُقْدَةً وَلاَ يَحُلُّهَا حَتَّى يَنْقَضِيَ أَمَدُهَا أَوْ
يَنْبِذَ إِلَيْهِمْ عَلَى سَوَاءٍ فَرَجَعَ مُعَاوِيَةُ