Nam – Myoho – Renge – Kyo
[Through their sincere offerings to the Buddha,] mortal husbands and
wives are said to be born together in world after world, time after
time. So when a common mortal attains enlightenment, both husband and
wife attain Buddhahood together.
Letter to the Wife of Hyoei Sakan;
Gosho, p. 1102
Nam – Myoho – Renge - Kyo