Shmuel Bais 18:1-2

Orthodox Jewish Bible

18 And Dovid mustered HaAm that were with him, and set sarei alafim, and sarei me’ot over them.

² And Dovid sent forth a third part of the people under the yad Yoav, and a third part under the yad Avishai Ben Tzeruyah (Yoav’s brother), and a third part under the yad Ittai the Gitti. And HaMelech said unto HaAm, I will surely go forth with you myself also.