The Gathas
The Gathas appear in the Yasna

Ahunavaiti Gatha .......... Yasna 28 to 34
Ushtavaiti Gatha ........... Yasna 43 to 46
Spenta Mainyu Gatha ... Yasna 47 to 50
Vohu Xshathra Gatha ............ Yasna 51
Vahishtoishti Gatha ............... Yasna 53