I think this passage sounds more like Taittiryiya or Brihad Aranyaka. If you use Jacob you could perhaps find the passage by looking for ananda.
Greetings
Victor van Bijlert 

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From: INDOLOGY <indology-bounces@list.indology.info> on behalf of Patrick Olivelle via INDOLOGY <indology@list.indology.info>
Sent: Thursday, January 16, 2025 7:57:24 PM
To: Harsha Dehejia <harshadehejia@hotmail.com>
Cc: Indology List <indology@list.indology.info>
Subject: Re: [INDOLOGY] Mundaka Upanishad
 
I do not think there is any such expression in the Muṇḍaka.



On Jan 15, 2025, at 9:56 PM, Harsha Dehejia via INDOLOGY <indology@list.indology.info> wrote:

Friends:

Could you please give me the exact quote in Sanskrit from the Mundaka which goes something like this:

Brahman is joy, through joy it expresses and into joy it returns.

Kind regards,

Harsha
Harsha V. Dehejia

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