Asad Shah, 40, was attacked outside his store and was found injured outside in the Shawlands area of Glasgow on March 24th.
Police described the attack as religiously prejudiced.
His message wished a "very happy Easter especially to my beloved Christian nation" and posted about a Good Friday celebration event.
Family and friends of Asad Shah gathered for prayers at the Bait-Ur-Rahman Mosque at the Ahmadiyya Muslim Centre in the west of the city.
Tanveer Ahmed, 32, from Bradford in West Yorkshire, has since appeared in court charged with murder.
Mr Shah was born in Rabwah in Pakistan, and moved to Glasgow in 1998 to join his father in business.
Prayers were led at the hour-long service by Mansoor Shah, vice president of the Ahmadiyya Muslim Community UK.
Inside the hall at the mosque in the city's Yorkhill area reads the message: "Love For All Hatred For None".
In a tribute to Mr Shah, his family said he treated everyone "with the utmost kindness and respect".
They said: ''He was a brilliant man, recognising that the differences between people are vastly outweighed by our similarities.
"And he didn't just talk about this, he lived it each and every day, in his beloved community of Shawlands and his country of Scotland.''
An online fundraising campaign set up to support his family raised more than £100,000.
It was meant to raise £1,500 to help the family with funeral costs - but donations totaled £111,526 on the GoFundMe page.
More than 6,000 donations were made to the page.
Among the public figures who attended the funeral were Sandra White, MSP for Glasgow Kelvin prior to the Scottish Parliament being dissolved ahead of May's election.
The shopkeeper's death shocked members of the Shawlands community, who came together in their hundreds for a silent vigil and to lay floral tributes in his memory.
Mourners at Asad Shah's funeral
A statement from the Shah family read: "On Thursday evening (24th March), a beloved husband, son, brother and everyone's friend, Asad Shah, was taken away from us by an incomprehensible act. We are devastated by this loss.
"A person's religion, ethnicity, race, gender or socioeconomic background never mattered to Asad.
"He met everyone with the utmost kindness and respect because those are just some of the many common threads that exist across every faith in our world. He was a brilliant man, recognising that the differences between people are vastly outweighed by our similarities. And he didn't just talk about this, he lived it each and every day, in his beloved community of Shawlands and his country of Scotland."
They added: "If there was to be any consolation from this needless tragedy, it came in the form of the spontaneous and deeply moving response by the good people of Shawlands, Glasgow and beyond.
"As a family, we would like to express our deepest gratitude to all who have organised and participated in the street vigils, online petitions and messages.
"You have moved us beyond words and helped us start healing sooner than we thought possible. You were Asad's family as much as we are and we will always remain with you."
The Shah Family finished: "We need to grieve and heal away from the public eye."
