They have attained Nirvana even in this life

 Yesaṃ sambodhiyaṅgesu, sammā cittaṃ subhāvitaṃ;
Ādānapaṭinissagge, anupādāya ye ratā;
Khīṇāsavā jutimanto, te loke parinibbutā.

They have attained Nirvana even in this life whose minds are full of regard for truth, energy, concentration, and calmness, who cling to nothing and have overcome all evil thoughts.

Dhammapada, 89.