Timeline for Why is there a dispute as to which tefillin are the correct ones?

5 events

when toggle format	what		by	license	comment
Dec 18, 2017 at 16:39	comment	added	mevaqesh		Based on your description, ikkar hasser min hasefer. I don't he'd mind if you edit the essential answer into the post. @robev
Dec 18, 2017 at 16:08	comment	added	robev		@mevaqesh Rav Kasher suggests the uncertainty arose almost immediately after it was enacted. He brings sources that indicate the machlokes could be even as early as late amora'im, and brings other examples to justify this idea (such as what constitutes Teruah for Rosh HaShanah). Everyone wore whatever tefillin they wanted, and it later became disputed which became the authoritative pair. I'd edit this in the answer, but I don't want to overpower Shalom's answer. He can add this in himself if he wants.
Dec 18, 2017 at 15:42	comment	added	mevaqesh		How does this answer the question? If people wear tefillin every day, then how did uncertainty arise a millennium or more, after this suggested enactment?
Dec 18, 2017 at 15:32	history	edited	robev	CC BY-SA 3.0	added 60 characters in body
Jun 1, 2015 at 7:18	history	answered	Shalom	CC BY-SA 3.0