69 The adjective “left” is interpretive, based on the context. Note that the next line pictures Jael holding the hammer with her right hand.
70 The verb used here is from the same root as the noun “hammer” in the preceding line.
71 Or “head.”
72 The phrase “his head” (an implied direct object) is supplied in the translation for clarification.
73 Heb “she pierced his temple.”

In other versions

She sent her hand to the tent peg

and her right hand to the workmen’s mallet;

she struck Sisera;

she crushed his head;

she shattered and pierced his temple.

Her hand reached for the tent peg,

her right hand for the workman’s hammer.

She struck Sisera, she crushed his head,

she shattered and pierced his temple.

She reached for a tent peg,

her right hand, for a workman’s hammer.

Then she hammered Sisera—

she crushed his head;

she shattered and pierced his temple.

Then with her left hand she reached for a tent peg,

and with her right hand for the workman’s hammer.

She struck Sisera with the hammer, crushing his head.

With a shattering blow, she pierced his temples.

She reached out her hand to the peg,

and her right hand for the workman’s hammer;

and she struck Sisera, crushed his head,

and she shattered and pierced his temple.

She put her hand to the nail,

And her right hand to the workmen’s hammer;

And with the hammer she smote Sisera, she smote off his head,

When she had pierced and stricken through his temples.

Public Domain