Sefer Mizmor LeAssaf by Hacham Sasson ben Mordechai Shanduch ספר מזמור לאסף לששון בן מרדכי

Mizmor LeAssaf – laws on prayer, sermons, and piyuttim, and mussar

Hacham Shanduch was the leader of baghdad in the mid 1700's and he passed away in 1830 , right around when the Ben ish Hai was born.

This is a rare sefer well sough after by Sepharadim specially. practically unfindable online