وأَحْسَنand acted kindly سَعْدSaʿd فيin الذيwhat كانَwas بينَناbetween us
وأَحْسَن سَعْد في الذي كانَ بينَنا
فإنْso if عادَhe returns بالإحْسانِwith kindness فالعودُthen the return أحمَدmore praiseworthy
فإنْ عادَ بالإحْسانِ فالعودُ أحمَد
And Saʿd acted kindly in what passed between us;
And Sa'd did good in what was between us
so if he repeats his kindness, the repetition is more praiseworthy.
If he returns with kindness, return is most praised
Sol 6.1