The angels first recorded in Isaiah 6 crying, “Holy, holy, holy is the Lord of hosts; the whole earth is full of his glory!" Centuries later, in Revelation, the four living creatures are recorded as follows, "Day and night they never stop saying: “‘Holy, holy, holy is the Lord God Almighty,’ who was, and is, and is to come.”
If that's good enough for the angels, works for me.
Προσκυνοῦμεν Πατέρα, καὶ τὸν τούτου Υἱόν τε, καὶ τὸ Ἅγιον Πνεῦμα, τὴν Ἁγίαν Τριάδα, ἐν μιᾷ τῇ οὐσίᾳ, σὺν τοῖς Σεραφείμ, κράζοντες τό· Ἅγιος, Ἅγιος, Ἅγιος εἶ, Κύριε.
We bow down in worship to the Father and His Son and the Holy Spirit, the Holy Trinity, one in essence; and we cry aloud with the Seraphim: Holy, Holy, Holy are You, O Lord.
I would respectfully suggest that there is more to your comment than you posted.
The number 3 in Scripture is very important......as are most numbers.
The number three in the scriptures denotes emphasis, reinforce or strengthen the message. For example Peter's three denials to Jesus. (Mat.26:34,75) And Peter's three-fold vision instructions emphasized to him not to doubt but go ahead, to kill and eat unholy and unclean animals according to the Law. (Acts 10:9-16)
Matthew 26:34,75 (NASB)
"Jesus said to him, “Truly I say to you that this very night before a rooster crows, you will deny Me
three times.”75 And Peter remembered the word which Jesus had said, “Before a rooster crows, you will deny Me three times.” And he went out and wept bitterly."
Acts 10:9-16 (NASB)
"On the next day, as they were on their way and approaching the city, Peter went up on the housetop about the sixth hour to pray. 10 But he became hungry and was desiring to eat; but while they were making preparations, he fell into a trance; 11 and he *saw the sky opened up, and an object like a great sheet coming down, lowered by four corners to the ground, 12 and there were in it all kinds of four-footed animals and crawling creatures of the earth and birds of the air. 13 A voice came to him, “Get up, Peter, kill and eat!” 14 But Peter said, “By no means, Lord, for I have never eaten anything unholy and unclean.” 15 Again a voice came to him a second time, “What God has cleansed, no longer consider unholy.” 16
This happened three times, and immediately the object was taken up into the sky
Holy, Holy, Holy,( Isaiah 6:3, Rev. 4:8)
Isaiah 6:3 (NASB)
"And one called out to another and said,
“Holy, Holy, Holy, is the Lord of hosts, The whole earth is full of His glory.
Revelation 4:8 (NASB)
"And the four living creatures, each one of them having six wings, are full of eyes around and within, and day and night [a]they do not cease to say, “Holy, holy, holy is the Lord God, the Almighty, who was and who is and who
is to come.”
So the fact that the heavenly creatures, Seraph, repeat Holy, Holy, Holy, emphasize the Superlative Holiness and the Glory of the Lord of the heavens and is just not repetitive prayers.