Is it permissible to give charity from one's private funds with the intention of being reimbursed from the charity money when one forgets to carry it, and is it permissible to take a small loan from the charity money with the intention of returning it later?

It is permissible to give charity from one's private money with the intention of replacing it from the charity money upon returning home, because it is an act of benevolence and hastening to good deeds. Money is not designated by its physical form, and the giver's responsibility is discharged by giving the same value. As for the trusted person borrowing from a trust, its permissibility is conditioned upon knowing the owner's consent or having their permission. Otherwise, it is forbidden or disliked depending on the situation of the trusted person, the depositor, and the type of deposit.