#Onan

See how you translated this name in [[:en:bible:notes:gen:38:03|38:4]].

#Do the duty of a brother-in-law to her

in-law to her** - This refers to a custom that when the oldest brother dies before he and his wife have a son, the next oldest brother would marry and sleep with the widow. When the widow gave birth to the first son, that son was considered the son of the oldest brother and he would receive the oldest brother's inheritance.

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The phrase "in the sight" refers to Yahweh seeing Onan's wickedness. AT: "was evil and Yahweh saw it" (See: [[:en:ta:vol1:translate:figs_idiom]])

#Yahweh killed him also

Yahweh killed him because what he did was evil. This can be made clear. AT: "So Yahweh killed him also" (See: [[:en:ta:vol1:translate:figs_explicit]])