It is narrated from Ibrahim (may Allah have mercy on him) that a man made an admission before Shurayh (may Allah have mercy on him) and then began to deny it. Shurayh (may Allah have mercy on him) said to him: The son of your maternal aunt's sister has testified against you.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الإقرار / 11452