Is a partner who was negligent in managing a project that incurred losses because of him, religiously obligated to compensate his partner for his share of these losses?

The partner's hand is a hand of trust, and the rule is that trusts are not guaranteed except by transgression or negligence. Therefore, the partner does not guarantee the share of his partner unless he transgresses or is negligent. Proving transgression or negligence is referred to the clauses of the partnership contract, custom, and experts. It is advisable for disputing parties to reconcile.