Talmud (Rodkinson Edition) — Book 2…
“ Who of the Tanaim ever held, that on Sabbath tephilin must be worn (in order that it might be said the first Tana of the Mishna is in accordance with his opinion) ? That was R. Aqiba; as we have learned: It is written [Exod. xiii. 10] : "And thou shalt keep this ordinance in its season from year to year." And elsewhere [Tract Menachoth] where there is a dispute between R. Jose the Galilean and R. Aqiba, it concludes with the statement that R. Aqiba holds the wearing of tephilin on Sabbath to be legal. Does R. Aqiba indeed hold that Sabbath is (also) a proper time for the wearing of tephilin? ”
