The number 13

One, love, and 26

אחד = 13 · אהבה = 13. And 13 + 13 = 26 = יהוה = 26.

אחד is the last word of the Shema — “the Lord is one” — and the verse that follows begins ואהבת, “and you shall love”, from the same root as אהבה. That the two share a value, and that together they make the value of the Tetragrammaton^{[3] Source: Tetragrammaton}, has been noticed for as long as gematria has been practised, and it is the kind of observation the tradition valued: it does not prove anything, it illuminates a text people already held. The Jewish Encyclopedia’s description of gematria as a support for interpretation rather than a source of it fits this example exactly^{[6] Source: Gematria}.

Thirteen in Jewish tradition

Thirteen recurs in Jewish life more than any number except seven, and most of the recurrences are counts, not gematria — worth distinguishing from the value above.

• The Thirteen Attributes of Mercy, which the rabbis count in God’s self-description at Exodus 34:6–7 and which are recited on fast days and before the High Holy Days^{[1] Source: Thirteen Attributes of Mercy[2] Source: Exodus 34:6–7}.
• Bar mitzvah at thirteen, the age of legal majority for a boy.
• Thirteen principles of faith in Maimonides’ formulation, and thirteen rules of interpretation attributed to R. Ishmael, recited daily in the morning service.
• Thirteen months in a Hebrew leap year, which adds a second Adar.

Written as a numeral, thirteen is י״ג: yod (10) and gimel (3) with the gershayim mark^{[4] Source: Hebrew numerals}. Because the letters spell nothing, it is a plain number — unlike 15 and 16, which are written ט״ו and ט״ז to avoid spelling part of the divine name.

The unlucky thirteen

The Western fear of thirteen — triskaidekaphobia — is real, widespread and surprisingly hard to trace. The popular explanations (thirteen at the Last Supper; a thirteenth guest at a Norse feast; the arrest of the Templars on Friday 13 October 1307) are mostly retrospective, and the specific dread of Friday the 13th is not clearly attested before the nineteenth century^{[5] Source: Triskaidekaphobia}. None of it involves letter-values. It is a belief about the number itself, which is exactly what gematria is not: in gematria a number has no character of its own, only the company of the words that share it. Thirteen’s company in Hebrew is “one” and “love”. A reader who finds that the same number is dreaded in Paris and auspicious in Jerusalem has learned something true about numbers: their meanings are given, not found.

13 in English ciphers

Thirteen is too small a total for most English words in the ordinal ciphers, so it is reached mainly by three-letter words and by the reduced tables, whose range is narrow. The table runs a fixed candidate list through all fourteen ciphers.

Gematria 13: words that match

The 13 gematria matches below are computed from a fixed list of common words — never searched for hits — so the misses are shown alongside the matches. Try any word on the calculator to check a value of your own.

Notice that “God” equals 13 only in Septenary, “Bible” and “Allah” only in Chaldean, and “Love” and “One” in none. English words landing on 13 tells you about the table that put them there; the Hebrew pair above is a fact about Hebrew.

Reading 13 honestly