The most likely source is probably bats. The virus originated in animals and was transmitted to humans. There is no credible evidence that we found showing the virus was from a lab and released as a form of biowarfare.
The lab theories have been prevalent on social media. However, as the Science Insider video below shows, there is no reason to believe the virus came from a lab. In researching the issue, and in addition to the video, we found this information from BBC News:
“One online theory that surfaced in January suggested the virus could have been engineered in a lab as a bioweapon. This allegation has been repeatedly dismissed by scientists, who note that studies show the virus originated in animals - most likely in bats.
Viruses can also be engineered for the purposes of scientific research. For example, studies may improve the ability of a pathogen to cause disease, to investigate how viruses could mutate in future.
But a US study of the coronavirus genome published in March found no signs it had been engineered. ‘By comparing the available genome sequence data for known coronavirus strains, we can firmly determine that Sars-CoV-2 originated through natural processes,’ co-author Kristian Andersen, from Scripps Research in California, said at the time.”
As the Science Insider video states the myth that Sars-CoV-2 came from a lab is just that, a myth.
A staggering 30% of Americans believe the Sars-Cov-2 lab myth. This video clearly shows that the 30% are mistaken.