Sayyiduna Abdullah bin Ukbarah (may Allah be pleased with him), who had the honour of being a Companion, says: Khilal is a Sunnah.
Al-Tabarani recorded it in al-Mu'jam al-Awsat and al-Mu'jam al-Saghir; its chain contains a narrator, Abd al-Karim bin Abi al-Mukhariq, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1208