It is easy to overlook things. The New Testament, starting with the Gospel according to Matthew, starts out pretty much like water from a firehose. The Old Testament starts out that way as well. And the sermons of Jesus, with the Sermon on the Mount being the first one, are like that as well. Things come at you so fast; it’s sometimes hard to take it all in.
It would be incredibly easy to overlook the first use of the word “Father” within the Sermon on the Mount. The translation of Matthew 5:16 is usually something like, “Let your light shine before others, so that they may see your good works and give glory to your Father who is in heaven.”
Did you see how it was almost hidden within the text? I can almost imagine the people who heard those words for the first time sort of jumping up from where they were. I can also imagine them talking to one another saying, “Did he just call God ‘Father’?” “And did he just call God OUR Father?”
That kind of language did not happen too frequently in the Old Testament. In fact it is extremely rare.
For those who love to count things, Jesus uses the word Father seventeen times within this Sermon on the Mount. The middle time—the ninth from either way—is the “Our Father” in the Lord’s Prayer. And at the very last time, Jesus uses the words “my Father.” Apart from that, it is always “your Father.”
I think there is a pattern here that would take too long to explain. More importantly, I would think most people would expect more of “my Father” from Jesus and him saying “your Father” only a little and especially at the end.
But that’s what Jesus likes to do; he turns things around—those who are headed for hell, death, and depression, he sets them in the opposite direction. And he LOVES to overflow with his love.