Safwan bin Yahya al-Bajali is one of the companions of three Shia Imam, Muhammad al-Jawad, Ali al-Ridha and Musa al-Kadhim.
Shaykh Tusi[1] and Ahmad ibn Ali al-Najashi[2] describe him as one of the most reliable and authentic narrators of Hadiths.
It is said[3] that Safwan would offer one hundred and fifty Rakat during night and fasted for three months every year.
"[5] It is also said that he made a promise to two of his pious friends that if they died before him, he would do for them what they do for themselves of good deeds and charity, as long as he is alive and did so.
He wrote about thirty books[7] including the books of Wudu, Prayer, Fasting, the Hajj, Zakat, Marriage, Divorce, Obligations, Recommendations, Buying and Selling, Setting slaves free and Management, Good tidings and others.