On 15th February 1930 C.E. in the village of Boparai at Gurdwara Sachkhand Sahib, while listening to the kirtan of Asa Di Vaar, Sant Giani Sundar Singh Ji Bhindranwale left their mortal frame for Sachkhand. In their lifetime Sant Ji completed 21 Lareevaar Kathas of Sri Guru Granth Sahib Ji 21. The last Katha was completed by Sant Giani Gurbachan Singh Ji Khalsa Bhindranwale. Sant Ji taught over 1300 Vidhiarthis, of whom 1000 became Akhand Paathis, 200 became Parcharaks, and 100 became Kathavaachiks. Sant Giani Sundar Singh Ji spent all their life in the selfless service of the Khalsa Panth. The following extract is from Sri Gurmukh Parkash by Sant Giani Gurbachan Singh Ji Khalsa Bhindranwale, who witnessed the final moments of Sant Giani Sundar Singh Ji at Gurdwara Sachkhand Sahib, Boparai:
ਤਿੰਨ ਵਜੇ ਸਭ ਸਿੰਘ ਮਿਲ ਆਏ। ਆਸਾ ਵਾਰ ਕੀਰਤਨ ਕੋ ਗਾਏ।
At 3 am all the Singhs met together in the Darbar Sahib and sung Asa Di Vaar Kirtan.
ਸੋਲਾਂ ਛੱਕੇ ਪੂਰਨ ਭਏ। ਸਤਾਰਵਾਂ ਛੱਕਾ ਗਾਵਤ ਲਏ॥੪੧॥
16 Chakkas (1 Chakka = Chhant + Pauri) were completed. The 17th Chakka was started with the following Pankti:
ਆਸਾ ਮਹਲਾ ੪ ॥
ਜਿਨ ਅੰਤਰਿ ਹਰਿ ਹਰਿ ਪ੍ਰੀਤਿ ਹੈ ਤੇ ਜਨ ਸੁਘੜ ਸਿਆਣੇ ਰਾਮ ਰਾਜੇ ॥
Those whose hearts are filled with the love of Har, Har, are the wisest and most clever people, O Omnipresent King.
ਚੌਪਈ ॥ ਛੱਕਾ ਪੜ੍ਹ ਕੀਰਤਨੀ ਅਟਕੇ। ਅਖੰਡ ਪਾਠ ਨਾਵੇਂ ਮਹਿਲ ਤੱਟਕੇ।
After completing the Chakkas, the Kirtan was stopped and the Bhog Saloks of the ongoing Sri Akhand Paath Sahib commenced.
ਅਖੰਡ ਪਾਠ ਕਾ ਭੋਗ ਜਬ ਪਾਯਾ। ਅਚਰਜ ਰੰਗ ਚੇਹਰੇ ਸੰਤ ਆਯਾ॥੪੨॥
When the Sri Akhand Paath Sahib Bhog was completed, a wondrous glow appeared on Sant Giani Sundar Singh Ji's face.
ਖਿੜਿਆ ਮਸਤਕ ਰੰਗ ਸੋ ਲਾਲੀ। ਜਨ ਸੂਰਜ ਚੜਿਆ ਅੰਸੁ ਮਾਲੀ।
Sant Ji's face was glowing with the same radiance as the rays of the rising sun.
ਸੀਸ ਝੁਕਾਯਾ ਸੰਗਤਿ ਜਬ ਹੀ। ਪਾਠ ਸਮਾਪਤੀ ਲਖ ਸਭ ਹੀ॥੪੩॥
The whole Sangat including Sant Ji bowed their heads at the completion of the Akhand Paath Sahib.