on one's deathbed

Its proponents have sought to differentiate it from suicide, which they say is often an emotional and impulsive act, while the ritual fast on one’s deathbed is a voluntary, rational act.

If two people break away from everything on earth and fly off into the unknown, or at least one of them, and before flying off or going to ruin he comes to some one else and says, ‘Do this for me’—some favor never asked before that could only be asked on one's deathbed—would that other refuse, if he were a friend or a brother?”

T. Tembarom to live with until one lay down on one's deathbed.

True, it is a solemn thing to lie for days on one's deathbed, waiting, waiting, not knowing the day nor the hour of the last breath.