In wa-la-sharru wāṣili khullatin ṣarrāmuhā, sharr gives emphatic evaluative force. Khullah denotes a close bond of friendship.
The word wāṣil initially promises one who maintains ties, only for ṣarrāmuhā to reverse the expectation. The verse relies on semantic opposition: professing a bond while cutting it through conduct is the object of criticism.