It is reported about Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that he did not fast much. He used to say: "If I fast, I become weak for the prayer, and (voluntary) prayer is dearer to me than (voluntary) fasting." When he did fast, he would fast three days each month.
This narration was recorded by Imam al-Tabarani, and its narrators are the narrators of the "Sahih". In some of its routes are these words: "He did not perform the forenoon (Duha) prayer."