For the source text click/tap here: Sanhedrin 49
To download, click/tap here: PDF
The next Perek 7 clarifies the details of the four types of capital punishment and established their order, which is, in descending order of severity: Stoning, burning, decapitation, and strangulation.
What difference does the severity of the execution make? In a situation where one has committed several capital offenses, each of which renders him liable to a different type of execution - since one cannot be executed more than once - he receives the more severe execution for which he is liable.
We explore the notion of tzelem elokim and murder before and after Sinai.