Significance of Mestha
Mestha, also spelled MestHa, is one of the four children of Horus, playing a vital role in Egyptian funerary traditions. He is depicted with a man's head and associated with the south, Isis, and the protection of the stomach and large intestines of the deceased. Mestha emerges from the serpent Am-khu and stands on a lotus flower. As a protector, he ensures the flourishing of the deceased's abode, following Ptah's command, and is considered a divine ruler alongside Horus, Isis, and Hapi.
The below excerpts are indicatory and do represent direct quotations or translations. It is your responsibility to fact check each reference.
Classical concept of 'Mestha'
From: The Book of the Dead
(1) Mestha is one of the four children of Horus, identified as a protector who will make Osiris Ani's abode flourish everlastingly, following Ptah's command.[1] (2) Mestha is one of the great divine rulers in Pe and Tep, alongside Horus, Isis, and Hapi, according to the text.[2] (3) Mestha is one of the four children of Horus, who are depicted on the side of the funereal chest and are responsible for protecting the intestines of Osiris or the deceased.[3] (4) One of the four "children of Horus" that has the head of a man and stands on a lotus flower.[4]
From: Egyptian Magic
(1) Mestha is one of the four children of Horus, man-headed and representing the south, who is associated with Isis and responsible for the protection of the stomach and large intestines.[5]
From: The Book of Am-Tuat
(1) MestHa is one of the four heads of the children of Horus that spring from the undulations of the monster serpent Am-khu.[6]