Israel Sava and Tevunah

In general Israel Sava is Zeir Anpin of Chokamh and Tevunah is Zeir Anpin of Binah.
The full description of Israel Sava and Tevuna would require a lengthy study of the Tree of Life.
Each one of the Sefirot of the Tree of Life has its own ten Sefirot. Israel Sava from the ‘Chest’ of Father/Chokmah and Tevunah from the ‘chest’ of Mother/Binah down. Since they are the lower parts of Chokmah and Binah, they provide us easier access to the levels above.