Tur, Orach Chayim
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שבת ויו"ט לאו זמן תפילין הן וחולו של מועד יש מסתפקין בו אם הוא זמן תפילין ומניחין אותן בלא ברכה וא"א ז"ל היה מניחן ומברך עליהם:
[fr]
- Shabbat and Yom Tov are not the time for tefillin. There is cause to have doubts whether its intermediate non–sacred day is the time for tefillin and one puts them on without a blessing. But my lord, my father the Rosh, may his memory be a blessing, would put them on and recite a blessing over them.