Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) narrates: I saw the Prophet (peace and blessings be upon him) urinating while sitting, keeping his thighs so wide apart that I felt distressed for him (for bearing such strain) for so long a sitting. When he came back, he made the sign of sixty-three with his hand and then said: The man of the Children of Israel was more careful about urine than you are; he had a pair of scissors with him, and if any urine got on his garment, he would cut it off.
Al-Tabarani recorded it in al-Mu'jam al-Kabir; from this Companion a hadith different from this one is recorded in the "Sahih". The chain of this report contains a narrator, Ali bin Asim, who made many errors and mistakes; he would be alerted to his mistake but would not retract, and he used to belittle the hadith masters (huffaz).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1036