The Buddha, while staying at Pubbakoṭṭhakā in Sāvatthi, asks Sāriputta if he believes that the five controlling faculties (indriya) if cultivated, lead to the deathlessness.
Sāriputta answers that he not only believes it, but has actually realised and understood it by insight. S.v.220 f.
See also Dhammapada v 97.