John Calvin on Deuteronomy 17:6

As His severity in exacting punishment, where murder has been unquestionably committed, shows how highly God rates the life of men, so the qualification, which we find here, declares, that he takes equal care for the preservation of innocent blood. For, since too great credulity would often impel the judges to condemn the guiltless, He here applies a remedy to this evil, forbidding that the crime should be punished unless proved by sure testimony. Although He has naturally inscribed this law upon every heart, yet he would have it written down, that its observance amongst the Israelites might be more sacred; for nothing is more dangerous than to expose men’s lives to the tongue of a single individual; but, where the consent of two or three is carefully weighed, any lurking falsehood is for the most part detected.

Lest, therefore, any one should be rashly condemned, and so innocence should be oppressed by any light conjectures, or insufficient accusations, or unjust prejudices, God here interferes, and does not allow any to be harshly dealt with, unless duly convicted.

Deuteronomy 22

Deuteronomy 22:8

8. When thou buildest a new house, then thou shalt make a battlement for thy roof, that thou bring not blood upon thine house, if any man fall from thence.

8. Si aedificaveris domum novam, facies tabulatum per circuitum in tecto tuo: nec pones sanguinem in domo tua, si quispiam ceciderit ex eo.