Yosef Karo, Shulchan Aruch — Orach Chaim 62One who was not precise with reading the Shema or did not make an…
“ Paragraph 4 — If due to illness or another mitigating factor one read the Shema silently [3] one has fulfilled his obligation. Rem"a: And one does this from the start if one is in a place that is not completely clean and one cannot clean it up due to various factors one thinks about the Shema in his heart. ”
