وجيشand the army نصيرNusayr جاءناcame to us عنon account of جَنايةٍan offense
وجيش نصير جاءنا عن جَنايةٍ
فكانso it was عليناupon us واجباًobligatory أنto يُزوَّراbe offered hospitality
فكان علينا واجباً أن يُزوَّرا
And Nusayr’s army came to us on account of an offense;
An army of aid came to us after a crime
So it was our duty to offer it hospitality.
So it was our duty that they be defeated