1)
What is the significance of "Ki Mal'achav Yetzaveh Lach"?
1.
Ta'anis 11a: Two angels that accompany a person, they testify about him.
2.
Sanhedrin 93a: Shlomo's mother gave this Brachah to him.
3.
Radak: Hashem commands them about you, to guard you. This is like "Imri Li Achi Hu" (Bereishis 20:13; say about me). This is like it says "Hine Anochi Shole'ach Mal'ach Lefanecha Lishmarcha ba'Derech" (Shemos 23:20).