Were there a Jewish religious movements /sects in the history that used to put or hanged their Tefillin on their chest / neck? (rather than on the arm against the heart).
As far as I remember, I read in past, that there some sects to interpret "וְהָיוּ הַדְּבָרִים הָאֵלֶּה אֲשֶׁר אָנֹכִי מְצַוְּךָ הַיּוֹם עַל לְבָבֶךָ" to have Tefillin right on the chest in front of the heart. Probably some of them also based their idea on "קָשְׁרֵם עַל-גַּרְגְּרוֹתֶיךָ, כָּתְבֵם עַל-לוּחַ לִבֶּךָ".
Now I'm looking for information about it, and I found nothing.