Praying Dhuhr and then Asr during Dhuhr time is called jamʿ al-taqdīm, an advance combination.
In the Hanafi discussion here, joining the imam's congregation is distinguished from praying alone. The latter is treated differently by Abu Hanifah and his two students.
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Book of Hajj: Standing at Arafat, Dhuhr and Asr, and Departure for Muzdalifah
Praying Dhuhr and then Asr during Dhuhr time is called jamʿ al-taqdīm, an advance combination.
In the Hanafi discussion here, joining the imam's congregation is distinguished from praying alone. The latter is treated differently by Abu Hanifah and his two students.