Translated by Ch. Browne and J. Swallow.
2. I will speak then, since I am so bidden. And I will speak both to the good shepherd here, and to you, his holy flock, as I think is best both for me to speak, and for you to hear to-day. Why is it that you have begged for one to share your shepherd's toil? For my speech shall begin with you, O dear and honoured head, worthy of that of Aaron, down which runs that spiritual and priestly ointment upon his beard and clothing.  Why is it that, while yet able to stablish and guide many, and actually guiding them in the power of the Spirit, you support yourself with a staff and prop in your spiritual works? Is it because you have heard and know that even with the illustrious Aaron were anointed Eleazar and Ithamar, the sons of Aaron?  For I pass over Nadab and Abihu,  lest the allusion be ill-omened: and Moses during his lifetime appoints Joshua in his stead, as lawgiver and general over those who were pressing on to the land of promise? The office of Aaron and Hur, supporting the hands of Moses on the mount where Amalek was warred down  by the Cross,  prefigured and typified long before, I feel willing to pass by, as not very suitable or applicable to us: for Moses did not choose them to share his work as lawgiver, but as helpers in his prayer and supports for the weariness of his hands.
 Ib. cxxxiii. 2.
 Lev. viii. 2.
 Ib. x. 1.
 Exod. xvii. 12.
 The Cross. The stretching out of Moses' hands was a type of the outstretched hands of our Lord Jesus, and His "intercession for the transgressors," upon the Cross.
Reference address : https://www.elpenor.org/gregory-nazianzen/church-nazianzus.asp?pg=2