Tafsir of Surah Qaf: Qaf is a mountain of emerald encircling the world

It is narrated from Sayyiduna Abdullah bin Buraydah (may Allah be pleased with him) concerning this saying of Allah, the Mighty and Majestic, "Qaf. By the glorious Qur'an" [Surah Qaf: 1], that he said: "This Qaf is a mountain of emerald that encircles the world, and upon it rest the edges of the sky."

It is narrated from Sayyiduna Qutbah bin Malik (may Allah be pleased with him) that he said: I heard the Prophet (peace and blessings be upon him) reciting Surah Qaf in the morning (Fajr) prayer. When he (peace and blessings be upon him) reached this verse, "And tall palm trees having fruit arranged in layers" [Surah Qaf: 10], Qutbah said: I asked: "What is meant by their being basiqat (tall)?" He (peace and blessings be upon him) said: "It means their length (and height)."
Imam Muslim narrated this hadith with a different wording and did not mention in it the explanation of the word basiqat, and it is sahih (authentic) on the condition of Imam Muslim.

It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that she said: I heard the Messenger of Allah (peace and blessings be upon him) say (while stating his lineage): "Ma'add bin Adnan bin Udad bin Zand bin Thara bin A'raq al-Thara." Then the Messenger of Allah (peace and blessings be upon him) recited: "He destroyed Ad and Thamud and the People of the Well (al-Rass) and many generations between them, whom none knows except Allah." Sayyidah Umm Salamah (may Allah be pleased with her) explained that A'raq al-Thara means Sayyiduna Isma'il bin Ibrahim (peace be upon them both), Zand means Hamaysa', and Thara means Nabt.
This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he was asked about this verse, "He utters no word except that with him is a watcher ready (to record it)" [Surah Qaf: 18], and he said: "Only good and evil are written. It is not written (such ordinary words as): 'O boy, saddle the horse,' or 'O boy, give me water to drink.' Only that is written which contains good or sin."
This hadith is sahih (authentic) on the condition of Imam Bukhari, but the two Shaykhs (Bukhari and Muslim) did not record it.