The Backwards Alphabet
Here is a story that the rabbis taught:
One day, a man came to Rabbi Shamai to ask about becoming a Jew. Rabbi Shamai told him that if he wanted to become a Jew, he would have to learn the Torah, or the Jewish law.
The man asked, "Well then, how many types of Torah do you have?"
"We have two types of law, or Torah," replied Rabbi Shamai. "We have the written Torah, and we have the oral Torah, the law as passed down by oral tradition."
"I believe in the written Torah," said the man. "But I don't trust laws that are passed on by word of mouth. If laws aren't written down, they are worthless. I will still become a Jew, on one condition: that you only teach me the written laws, but not the oral laws, not the spoken laws."
Upon hearing this, Rabbi Shamai said that the man could never become a Jew, that he was disrespectful, and then Rabbi Shamai told the man to leave.
But the man still wanted to know about becoming a Jew, so he went to Rabbi Hillel. Rabbi Hillel told him that if he wanted to become a Jew, he would have to learn Jewish laws — for example, he would have to learn the laws about eating kosher foods, and so on.
The man asked, "Well then, how many types of Torah do you have?"
"We have two types of law, or Torah," replied Rabbi Shamai. "We have the written Torah, and we have the oral Torah, the law as passed down by oral tradition."
"I believe in the written Torah," said the man. "But I don't trust laws that are passed on by word of mouth. If laws aren't written down, they are worthless. I will still become a Jew, on one condition: that you only teach me the written laws, but not the oral laws."
"Then I will accept you as a student," said Rabbi Hillel. "First, you must learn how to read Hebrew, so I will teach you the 22 letters of the Hebrew alphabet. Repeat after me: aleph, bet, gimel, dalet, he, vav, zayin, khet, tet, yod, khaf, lamed, mem, nun, samekh, ayin, pe, tsadi, kuf, resh, shin, tav."
The man repeated the entire Hebrew alphabet after Rabbi Hillel -- "Aleph, bet, gimel, dalet,...." -- until he had all the letters memorized.
The next day, the man came back to learn the written law from Rabbi Hillel. Rabbi Hillel said, "Let's make sure you remember the 22 letters of the Hebrew alphabet. Repeat after me: tav, shin, resh, kuf, tsadi, pe, ayin, samekh, nun, mem, lamed, khaf, yod, tet, khet, zayin, vav, he, dalet, gimel, bet, aleph."
The man looked confused. "But that's not the way you taught them to me yesterday," he said.
"Yes, that's true," said Rabbi Hillel, "and as you can see, you must learn to rely upon me and my teaching. In just the same way, you must learn to rely upon the spoken law."
Source: Babylonian Talmud, Tractate Sabbath 31a.