OET interlinear 2 SAM 3:28

uW Translation Notes:

Note 1 topic: figures-of-speech / explicit

וּ⁠מַמְלַכְתִּ֛⁠י

(Some words not found in UHB: and=he/it_listened Dāvid from,after so and=he/it_said innocent I and,kingdom_of,my from,with YHWH until forever from,the_blood(s)_of ʼAⱱnēr son_of Nēr )

The implication is that David is referring not just to his current reign but to the continuing rule of his descendants. You could include this information if that would be helpful to your readers. Alternate translation: [and my royal dynasty]

Note 2 topic: figures-of-speech / metonymy

מִ⁠דְּמֵ֖י אַבְנֵ֥ר

(Some words not found in UHB: and=he/it_listened Dāvid from,after so and=he/it_said innocent I and,kingdom_of,my from,with YHWH until forever from,the_blood(s)_of ʼAⱱnēr son_of Nēr )

Here, blood represents the killing of Abner. If it would be helpful in your language, you could use an equivalent expression or plain language. Alternate translation: [regarding the death of Abner]

Note 3 topic: translate-plural

מִ⁠דְּמֵ֖י אַבְנֵ֥ר

(Some words not found in UHB: and=he/it_listened Dāvid from,after so and=he/it_said innocent I and,kingdom_of,my from,with YHWH until forever from,the_blood(s)_of ʼAⱱnēr son_of Nēr )

The word blood is plural here because it refers to blood shed by violence. Your language may use the plural form of its word for blood to mean the same thing. If not, you could express the meaning in another way. Alternate translation: [of the bloodshed against Abner]