«لَهُمْ إِلْفٌ وَلَيْسَ لَكُمْ إِلَافُ»
They have a bond of association; you do not have an equivalent one.
Rather than saying “You are wrong,” the speaker supplies a contrast in circumstances. The second expression supports the implicit denial of the earlier claim. This produces both argumentative force and economy of wording.
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Ellipsis in Istiʾnāf and Two Grounds for Waṣl
«لَهُمْ إِلْفٌ وَلَيْسَ لَكُمْ إِلَافُ»
They have a bond of association; you do not have an equivalent one.
Rather than saying “You are wrong,” the speaker supplies a contrast in circumstances. The second expression supports the implicit denial of the earlier claim. This produces both argumentative force and economy of wording.