It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) ordered him "to give one dinar or half a dinar in charity." Qatadah explained it: if he finds one dinar, he should give one, and if he does not find more, then he should at least give half a dinar.
Qatadah did not hear it from Miqsam.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1514