Perhaps you mean Taittirīya?

ānandād dhy eva khalv imāni bhūtāni jāyante | ānandena jātāni jīvanti | ānandaṃ prayanty abhisaṃviśantīti | (TU 3.6.1)

Martin Gansten

Den 2020-10-26 kl. 16:44, skrev Harsha Dehejia via INDOLOGY:

Friends:

Could anyone please send me the Sanskrit of the following verse from the Mumdaka Upanishad:

From joy springs all creation
By it is sustained
Towards joy it proceeds
And to joy it returns.

Kind regards,
Harsha

Prof. Harsha V. Dehejia