The line "Kaya karmo bandhay hasta hasta" is a reflective phrase in Jainism, often found in prayers or devotional songs, highlighting the nature of karmic bondage. In Jain philosophy, kaya means body, karma refers to actions (and their resultant binding particles), bandhay means binding or bondage, and hasta hasta implies 'while laughing' or 'with joy and carelessness.'

Interpretation in Jainism: This phrase expresses the idea that, in the course of enjoying worldly pleasures and bodily comforts (often without awareness or restraint), living beings accumulate (bind) karmas to the soul. Even while laughing, enjoying, or living life without mindfulness, one is constantly binding new karmas through bodily activities, speech, and even thoughts.

Jain Teaching: According to Jainism, ignorance and attachment (raag-dvesh) are primary causes of karmic bondage. The soul, by engaging in activities propelled by passions and desires, binds new karmas even during seemingly harmless or joyful acts. Jainism advocates for awareness (samayik), restraint (samyam), and right conduct (samyak charitra) to minimize and ultimately eradicate karmic bondage.

Summary: The phrase is a reminder to be vigilant and mindful, as karmic bondage occurs even in moments of happiness and carelessness. Jain teachings encourage constant awareness and self-control to avoid accumulating new karmas and progress on the path of liberation (moksha).