Moses then saw how God wrote the word "long-suffering" in the Torah, and asked: "Does this mean that Thou hast patience with the pious?" But God answered: "Nay, with sinners also am I long-suffering." "What!" exclaimed Moses, "Let the sinners perish!" God said no more, but when Moses implored God's mercy, begging Him to forgive the sin of the people of Israel, God answered him: "Thou thyself didst advice Me to have no patience with sinners and to destroy them." "Yea," said Moses, "but Thou didst declare that Thou art long-suffering with sinners also, let now the patience of the Lord be great according as Thou has spoken." [251] The forty days that Moses spent in heaven were entirely devoted to the study of the Torah, he learned the written as well as the oral teaching, yea, even the doctrines that an able scholar would some day propound were revealed to him. [252] He took an especial delight in hearing the teachings of the Tanna Rabbi Eliezer, and received the joyful message that this great scholar would be one of his descendants. [253] The study of Moses was so planned for the forty days, that by day God studied with him the written teachings, and by night the oral. In this way was he enabled to distinguish between night and day, for in heaven "the night shineth as the day." There were other signs also by which he could distinguish night from day; for if he heard the angels praise God with "Holy, holy, holy, is the Lord of hosts," he knew that it was day; but if they praised Him with "Blessed be the Lord to whom blessing is due," he knew it was night. Then, too, if he saw the sun appear before God and cast itself down before Him, he knew that it was night; if, however, the moon and the stars cast themselves at His feet, he knew that it was day. He could also tell time by the occupation of the angels, for by day they prepared manna for Israel, and by night they sent it down to earth. The prayers he heard in heaven served him as another token whereby he might know the time, for if he heard the recitation of the Shema' precede prayer, he knew that it was day, but if the prayer preceded the recitation of the Shema', then it was night. [254] During his stay with Him, God showed Moses all the seven heavens, and the celestial temple, and the four colors that he was to employ to fit up the tabernacle. Moses found it difficult to retain the color, whereupon God said to him: "Turn to the right," and as he turned, he saw a host of angels in garments that had the color of the sea. "This," said God, "is violet." Then He bade Moses turn to the left, and there he saw angels dressed in red, and God said: "This is royal purple." Moses hereupon turned around to the rear, and saw angels robed in a color that was neither purple nor violet, and God said to him: "This color is crimson." Moses then turned about and saw angels robed in white, and God said to him: "This is the color of twisted linen." [255]