2 Samuel 3:26 KJV

And when Joab was come out from David, he sent messengers after Abner, which brought him again from the well of Sirah: but David knew it not.

Joab kills Abner David mourns for himJudgments are prepared for such scorners as Abner; but Joab, in what he did, acted wickedly. David laid Abner's murder deeply to heart, and in many ways...

Proverbs 26:23–26 Burning lips and a wicked heart are like a potsherd covered with silver dross. …
Proverbs 27:4–6 Wrath is cruel, and anger is outrageous; but who is able to stand before envy? …

From OpenBible.info, most relevant first.

JoabJehovah is his father. (1.) One of the three sons of Zeruiah, David’s sister, and “captain of the host” during the whole of David’s reign...
DavidBeloved, the eighth and youngest son of Jesse, a citizen of Bethlehem. His father seems to have been a man in humble life. His mother’s...
AbnerFather of light; i.e., “enlightening”, the son of Ner and uncle of Saul. He was commander-in-chief of Saul’s army (1 Sam 14:50; 1 Sam...
SirahRetiring, a well from which Joab’s messenger brought back Abner (2 Sam 3:26). It is now called ‘Ain Sarah, and is situated about a mile...

And when Joab יוֹאָב yôʾāb יוֹאָב Proper name
was come out וַיֵּצֵא wayyēṣēʾ יָצָא Verb · qal sequential imperfect, third person masculine singular · with and
from David מֵעִם mēʿim Preposition דָּוִד dāwid דָּוִד Proper name
he sent וַיִּשְׁלַח wayyišlaḥ שָׁלַח Verb · qal sequential imperfect, third person masculine singular · with and
messengers מַלְאָכִים malʾākîm מֲלְאָךְ Noun · masculine plural
after אַחֲרֵי ʾaḥărê אַחַר Preposition
Abner אַבְנֵר ʾabnēr אַבְנֵר Proper name
which brought him again וַיָּשִׁבוּ wayyāšibû שׁוּב Verb · hiphil sequential imperfect, third person masculine plural · with and
from the well אֹתוֹ ʾōtô Object marker · with suffix: third person masculine singular מִבּוֹר mibbôr בּוֹר Proper name · with preposition
of Sirah הַסִּרָה hassirâ סִרָה Proper name
but David וְדָוִד wĕdāwid דָּוִד Proper name · with and
knew לֹא lōʾ Negative יָדָע yādāʿ יָדַע Verb · qal perfect, third person masculine singular

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