In Jainism, the term "Adhyayan" generally refers to a section or division of scriptures, particularly within the Jain Agamas (canonical texts). The Agamas, especially the Śvetāmbara tradition's scripture known as the "Ācāranga Sūtra," "Sūtrakṛtāṅga," or other Anga texts, are divided into several Adhyayans (lessons or chapters).

"Adhyayan 3" specifically would mean the third chapter or section of a particular Jain scripture. The exact content of "Adhyayan 3" depends on which Agama you are referring to. For example:

• In the "Ācāranga Sūtra," Adhyayan 3 would be the third lesson or chapter, containing teachings of Lord Mahavira regarding the conduct and discipline of monks.
• In "Sūtrakṛtāṅga," Adhyayan 3 would have its own specific subject matter.

If you specify which text you are referring to, I can provide more precise details about the contents of the third Adhyayan in that particular scripture.