Hadith #142 (Jami' al-Tirmidhi)
Book: The Book on Purification
Narrator(s): Abdullah bin al-Arqam, Hanad bin al-Sari bin Mus'ab هناد بن السري بن مصعب, Hisham bin 'Urwa هشام بن عروة, Muhammad bin Khazim al-Darir محمد بن خازم أبو معاوية الضرير, Urwa ibn al-Zubayr عروة بن الزبير

He (Urwah) said: “While standing for the prayer he (Abdullah bin Al-Arqam) took a man by the hand leading him forward, he (Abdullah) was in front of the people, and he said: ‘I heard Allah’s Messenger say: “When standing for the prayer and one of you finds that he has to relieve himself then let him relieve himself first.”

Source: https://parallelquran.com/hadith/jami-al-tirmidhi-142/