Sahih Muslim Book 4, Hadith 73

They (the Companions of the Holy Prophet) said: Apostle of Allah, how should we bless you? He (the Holy Prophet) observed: Say:" O Allah! bless Muhammad, his wives and his offspring as Thou didst bless Ibrahim, and grant favours to Muhammad, and his wives and his offspring as Thou didst grant favours to the family of Ibrahim; Thou art Praiseworthy and Glorious."

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" Bless Muhammad (ﷺ)" and he did not say:" O Allah I

Sahih Muslim Book 4, Hadith 72
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The Messenger of Allah (ﷺ) said: He who blesses me once, Allah would bless him ten times.

Sahih Muslim Book 4, Hadith 74