Humayd narrates from a son of Sayyiduna Anas bin Malik (may Allah be pleased with him) that Sayyiduna Anas (may Allah be pleased with him) fell ill, and he had a doubt about the pregnancy of a slave-girl of his. He said: If I die, call a physiognomist for him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الدعوى والبينات / 21269