Exodus 20:13-14

Amplified Bible

¹³“You shall not commit murder (unjustified, deliberate homicide).^(A)

¹⁴“You shall not commit ^[a]adultery.^(B)

Exodus 20:14 Jesus amplified this commandment in Matt 5:27, 28. Not only is adultery forbidden, but also any act of sexual impurity or unchastity, and any form of pornography or other obscenity.

Deuteronomy 5:17-18

Amplified Bible

¹⁷‘You shall not ^[a]murder.

¹⁸‘You shall not commit ^[b]adultery.^(A)

Deuteronomy 5:17 Or commit homicide. In general, prohibits one from acting on one’s own initiative to deliberately take or maliciously cause to be taken, the life of another.
Deuteronomy 5:18 Jesus extended this commandment in Matt 5:27, 28. Not only is adultery forbidden, but also the act of looking at a woman with lustful (sexual) desire, which would include indulging oneself in pornography.