Mahavira’s last moments are not a single quoted sentence. Tradition says:

• He gave his final discourses over a continuous period of about 48 hours, which is recorded as the Uttaradhyāyana Sutra (the last teaching).
• He attained nirvāṇa (moksha) at Pavapuri in the state of Magadha, on the night of Kartika Krishna Amāvāsya, when his body was said to leave the earth and he was liberated.
• The exact year/date differs by tradition: Śvetāmbara tradition commonly marks nirvāṇa in 527 BCE, while Digambara tradition sometimes notes slightly different dating (often around 510 BCE). Both agree Pavapuri as the place of nirvāṇa and that his soul rose to Siddhāshila.

Key points kept in Jain practice:

• The focus is on the 48-hour discourse and the moment of liberation, not on a single concluding phrase.
• There are slight differences in details between Digambara and Śvetāmbara traditions, especially in dating and some narrative elements.

If you’d like, I can share a simple, authentic paraphrase of the Uttarādhyāyaṇa Sutra’s closing teaching and its spiritual meaning.