It is narrated on the authority of ‘Umayr ibn Talhah from his father that he went to Yamâmah and asked about Mûsaylamah and it was said to him: “He is the Messenger of Allâh.” He said: “No, (I do not admit his Prophethood) until I see him.” When he came to him, he asked him: “Are you Mûsaylamah?” He answered in the affirmative.

He further asked: “Who does come to you (with the Divine revelation)?” He said: “ar-Rahmân.” He asked: “Does he come to you in light or in darkness?” He said: “No, in darkness.” He said: “I testify that you are a liar and that Muhammad is truthful. Nevertheless, the liar of Rabee‘ah (Mûsaylamah) is dearer to us than the truthful one of Mudhar (Muhammad).”[1]

https://en.islamstory.com/en/artical/25686