If one touched the head tefillin first before putting on the arm tefillin, must he set it aside?

Synopsis

The Mechaber rules that if one encounters the head tefillin first, he must skip it and put on the arm tefillin first. The Biur Halacha notes that the Taz holds the same and that passing over tefillin is scripturally grounded differently from other mitzvot.

Early Acharonim
Lenient
Strict
Lesser cited
Major authority

Discussion

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