Musannaf Ibn Abi Shayba 1:1821

Abu Bakr narrated to us, he said: Hafs bin Ghiyath narrated to us, from Ibn Jurayj, from Ata, who said: A man stood up from near Ibn Abbas and said to him, "Where are you going?" He said, "I am going to pour out water (ahriqa al-ma')." He said, "Do not say 'I am going to pour out water,' but say, 'I am going to urinate (abulu).'"