Khums can be given to a poor sayyid whose living expenses are obligatory for another person to meet but who cannot, or does not, meet the sayyid’s living expenses. Ruling 1861.* The obligatory precaution is that one must not give a person entitled to receive khums an amount of khums that is more than his living expenses for the year in one go.
And if one gives such a person his living expenses for the year in instalments, then once the amount reaches the level of his living expenses for the year, it is definitely not permitted to give him any more.