Also, Ismail, Idrîs, Zal-Kifl; all were steadfast, patient.

The Quran names Zal-Kifl twice, both times as one of God's righteous servants in a list of prophets. It does not tell his story. It does not say when he lived, which people he was sent to, or what happened in his mission. It records his character instead: he was steadfast, patient, and among the most righteous, and God admitted him into His mercy (21:85-86, 38:48).
The name is a title, not a personal name. "Zal" (Dhul) means "the one of" or "the possessor of," and "kifl" carries the sense of a portion or share, and also of a pledge or guarantee. Later Muslim tradition most often identifies him with the biblical prophet Ezekiel, who preached to the Israelites in exile in Babylon, but that identification comes from the tradition, not from the Quran. The Quran Talk blog reads the name as "Possessor of Double Portion" and notes the Ezekiel link.
His first mention is in Sura 21, "The Prophets," right after the account of Job. Job called on God in his adversity, and God "relieved his adversity, and restored his family for him, even twice as much" (21:84). The next verses read: "Also, Ismail, Idrîs, Zal-Kifl; all were steadfast, patient. We admitted them into our mercy, for they were righteous" (21:85-86). The sura then moves on to Jonah and to Zachariah. Zal-Kifl is grouped with those who endured with patience and were rewarded with God's mercy.
His second mention, in Sura 38, follows the same pattern. After Job, whom God "found... steadfast" and called a submitter (38:44), come Abraham, Isaac, and Jacob, who "were chosen, for they were among the most righteous" (38:47). Then: "Remember Ismail, Elisha, and Zal-Kifl; among the most righteous" (38:48). The next verse draws the conclusion: "This is a reminder: The righteous have deserved a wonderful destiny" (38:49).
The Quran's lesson is in what it chooses to keep. It leaves out the details of his life and keeps the qualities that made him worthy: steadfastness, patience, and righteousness. Both passages connect being chosen with being "among the most righteous." That fits the Quran's statement that "GOD knows exactly who is best qualified to deliver His message" (6:124), a link the Quran Talk blog also makes. My own reading is that he is held up as an example of the reward promised to anyone who stays patient and righteous, God's mercy and the gardens of Eden (21:86, 38:49-50), more than as a story to follow event by event.
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