Rai died on Saturday at a suburban hospital here due to health issues. He was hospitalised a few weeks ago and later shifted to the ICU. He was reportedly battling cancer.
"Death has but one end... And words cannot define it,"
The 74-year-old actor also expressed grief on his blog by writing, "Death... the inevitable end."
Although Bachchan did not mention Rai's name in any of his social media posts, his each and every word was appearing as tribute to his daughter-in-law's father.
"Glimpses of reactions in the mind, of the lost one, of those that shall reflect on the lost one and suddenly then in the midst of sorrow and grief among the grieved and grieving.
"That walk to the ultimate destination and the reality... Embracing the tragedy, the discussions on its transport, its rituals, its formalities... The custom, the tradition, the visitors with the sadness and the embrace of consolation, the last rites, the carriage, the placement, the cremation...
"What to say what to put out where to put to... All laden with grief and departure," he wrote.
He concluded his blogpost with, "and the happiest of them all, is the one that has gone.. for he is already in the arms of the heavens and in a realm of peace and tranquility.."
(With PTI Inputs)