Noah in rabbinic literature "Sefer haYashar" describes another method for distinguishing them: the clean animals and fowls crouched before Noah, while the unclean ones remained standing. A difference of opinion concerning Noah prevails also with regard to his entering into the ark. According to some rabbis, Noah's faith was so small that he did not enter the ark until he stood ankle deep in water (Genesis Rabba xxxii. 9); others declare, on the contrary, that Noah waited for God's directions to enter the ark, just as he awaited His permission to leave it (ib. 34.4; Midrash Agadat Bereshit, in Jellinek, "B. H." iv. 11).
Noah's Ark remains a secular and religious symbol of peace today. In contrast to the Jewish tradition, which uses a term that can be translated as a "box" or "chest" to describe the Ark, surah 29:15 of the Quran refers to it as a "safina", an ordinary ship, and surah 54:13 describes the ark as "a thing of boards and nails". Abd Allah ibn Abbas, a contemporary of Muhammad, wrote that Noah was in doubt as to what shape to make the ark, and that Allah revealed to him that it was to be shaped like a bird's belly and fashioned of