1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ibn Faddal from ibn Bukayr from Zurarah who has said the following:

“I went to visit abu Ja‘far . I was a young person. The Imam described for me optional Salawat (prayers) and fasting and he noticed from my face that I considered it heavy. He then said to me, This is not like obligatory Salawat (prayers), so that on neglecting, one is destroyed. It is optional and if you cannot do on time, you can do compensatory prayer for it. They disliked that their deeds are taken up one day complete and one day incomplete. Allah, the Most Majestic, the Most Glorious, says, “Those who perform their Salah (prayer) all the time” (71:23). They (true Muslims) disliked continuing Salah (prayer) until sun declines on midday to the west; the doors of heaven open on such time.’”” (The meaning of ’all the time’, is not performing Salah (prayer) without any intervals).