«لو اختصرتم من الإحسان زرتكم / والعذب من الماء يهجر للإفراط في الخصر»
Had you moderated your generosity I would have visited; even sweet water may be avoided when its chill becomes excessive.
Ikhtaṣartum and al-khaṣr resemble each other verbally, but the former concerns curtailing and the latter coldness. The source places their relationship under quasi-derivation rather than secure shared-root derivation.
Their separate meanings must remain clear in any explanation.