Famed philanthropist Abdul Sattar Edhi, the founder of one of Pakistan's biggest welfare organisations, died in hospital late on Friday, his family said.
The announcement triggered a wave of accolades on TV and social media.
Pakistan's Prime Minister Nawaz Sharif paid tribute to "a great servant of humanity," and said he would receive a posthumous presidential medal and a state funeral.
Abdul Sattar #Edhi: The richest poor man
— JdoO (@WajidKJ) July 8, 2016
The 88-year-old's reputation for austerity and generosity resonated deeply in Pakistan, a country of 190 million people whose government is riddled with corruption and where public health and welfare services are weak.
Abdul Sattar Edhi has died. He was the Mother Theresa of Pakistan & did more for the poor than anyone could imagine: https://t.co/9IYHgX4LCT
— Murtaza Hussain (@MazMHussain) July 8, 2016
"He was the real manifestation of love for those who were socially vulnerable, impoverished, helpless and poor," PM Sharif said.
Abdul Sattar Edhi, father of orphans & d needy in Pakistan has died
What he has done is too priceless to be measured pic.twitter.com/HFXzza6J6Z
— M Barak Cherguia (@CherguiaMbark) July 8, 2016
The Edhi Foundation runs a vast fleet of ambulances, orphanages and medical clinics across the country.
Edhi's funeral on Saturday is expected to be one of the biggest in Pakistan's history.
'Why must you pick up Christians and Hindus in your ambulance?'
"Because the ambulance is more Muslim than you."
~Abdul Sattar Edhi
— Dar. (@EngnrDar) June 28, 2016
Edhi had been ill for several years after suffering kidney failure, Edhi's son Faisal told journalists in Karachi.
"He will be buried at Edhi Village tomorrow," Sharif said.