Sayyiduna Ammar bin Yasir (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "There are three whom the angels do not approach with good: the corpse of a disbeliever, one who is smeared with saffron, and the junub (one in a state of major ritual impurity); if he wishes to eat or sleep, let him perform ablution like his ablution for prayer."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8974