Shulchan Arukh, Orach Chayim Siman 29
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
ובו סעיף אחד
אין לברך שום ברכה כשחולץ תפילין אפילו כשחולצם ע"ש בין השמשות:
Mishna Berura Yomi
One should not make a blessing at all when he removes the tefillin even when he removes them on the eve of the Sabbath at [the time of] "between the suns" (dusk).