The teaching of Junen Nembutsu appears in the Eighteenth Vow of Amida Buddha
in Sutra of Immeasurable Life (Muryoju-kyo). It states that every person who
recites the nembutsu ten times shall be saved. "Namu Amida Butsu" is recited
eight times in one breath without voicing "tsu," a breath is taken and the
full "Namu Amida Butsu" is recited once making nine times. The final (tenth)
Nembutsu is chanted with the "tsu" almost silent again, as if one has
swallowed the word.