Babylonian Talmud: Tractate ‘Abodah Zarah
Folio 25a
[The same Rabbis also discuss the following:] And the sun stood still, and the moon stayed until the nation had avenged themselves of their enemies. Is not this written in the book of Jashar. What is the book of Jashar? — Said R. Hiyya b. Abba in the name of R. Johanan: It is the book of Abraham, Isaac and Jacob,
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Book of Jashar
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It is written in the Book of Ben Sira: All the days of the poor11 are evil;12 but are there not the Sabbaths and festivals?13 — [The explanation, however, is] according to Samuel. For Samuel said: A change of diet is the beginning of bowel trouble.10 Ben Sira said: The nights also.14 Lower than [all] the roofs is his roof,15 and on the height of mountains is his vineyard,16 [so that] the rain of [other] roofs [pours down] upon his roof and the earth of his vineyard [is washed down] into the vineyards [of others].17
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It is written in the book of Ben Sira: —56
A good wife is a precious gift;57 she will be put in the bosom of the God-fearing man.58 A bad wife is a plague to her husband. What remedy has he? — Let him give her a letter of divorce and be healed of his plague.
A beautiful wife is a joy to her husband;59 the number of his days shall be double.60
Turn away thy eyes from [thy neighbour’s] charming wife lest thou be caught in her net. Do not turn in to her husband to mingle with him wine and strong drink; for, through the form of a beautiful woman, many were destroyed and a mighty host are all her slain.61
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Use the find feature of your browser to look for the word “book”
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R. Jacob b. Aha found it written in the scholars’2 Book of Aggada:3 A heathen is executed on the ruling of one judge, on the testimony of one witness, without a formal warning, on the evidence of a man, but not of a woman, even if he [the witness] be a relation. On the authority of R. Ishmael it was said: [He is executed] even for the murder of an embryo. Whence do we know all this? — Rab Judah answered: The Bible saith, And surely your blood of your lives will I require;4
Aggadah (or Haggadah, from nagad, to declare), means the whole non-legal portion of Jewish learning. Here however, an actual law is cited from the Book of Aggadah. In the T. J. and Midrashim, many statements cited in the T. B. as being from the Book of Aggadah of the schools, are those cited under the name of Noachian precepts. Hence it is possible that the reference is to a collection of laws relating to Gentiles, and in order to distinguish it from specifically Jewish laws, it was called the Book of Aggadah (Weiss, Dor, III, p. 158).
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Gittin 21b
, because it is not possible to cut off the hand [and give it to her]. But where [it is written] on the horn of an ox [why need the ox be given to her]? Let the husband cut it off and give it to her? — Scripture says, He shall write and give to her.1 [This means that the Get must be on something] which requires only to be written on and to be given [to make it effective]: it excludes [something like] this which requires to be written on, to be cut off, and to be given [before it can become effective].
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If one studies the citation formulas, “it is written” does not neccessary mean that something is in fact being quoted as being scripture.