Some teach that Savitri as an Anushtubh verse, saying that speech is Anushtubh, and that we teach that speech. Let no one do this, but let him teach the Gayatri as Savitri. And even if one who knows this receives what seems to be much as his reward (as a teacher), yet this is not equal to one foot of the Gayatri.

In plain words: Some teachers teach the sacred Savitri prayer in a different verse form called Anushtubh, claiming it stands for speech. The Upanishad says not to do this, but to teach it as the Gayatri. Even a large payment given to a teacher who knows this is worth less than one part of the Gayatri.