Al-Matalib al-'Aliyah 3694 — Surah Sad

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he said: "A long period of time passed over us in which we did not know the true meaning and intent of this verse: 'They glorified (Allah) in the evening and after sunrise' [Surah Sad: 18], until we saw people performing the forenoon prayer (Salat al-Duha) (then its meaning became clear to us)."
Ahmad bin Mani' said: Abu Ahmad al-Zubayri informed us through Hanzalah bin Abd al-Hamid; he (transmitted it) from al-Dahhak bin Qays, and he from Sayyiduna Ibn Abbas (may Allah be pleased with them both).