"hāth bajra au dhvajā birājai" is Chaupai 5 of the Hanuman Chalisa, which Tulsidas wrote in Awadhi. It means: In your hands shine the thunderbolt and the flag. A sacred thread of munja grass sits on your shoulder. Read it slowly, one half at a time, and say the Awadhi aloud.
Awadhi text: Goswami Tulsidas, Gita Press reading, checked against three Gita Press printings and Rambhadracharya's Mahaviri. English meaning and word glosses: Wisdom's own, following the traditional reading, edited by Ankur Shukla.