John Calvin Commentary Genesis 47:7

"And Joseph brought in Jacob his father, and set him before Pharaoh: and Jacob blessed Pharaoh." — Genesis 47:7 (ASV)

And Joseph brought in Jacob his father. Although Moses relates, in a continuous narrative, that Jacob was brought to the king, yet I do not doubt that some time had intervened; at least, until he had obtained a place in which he might dwell, where he might leave his family more safely and with a more tranquil mind, and also, where he might refresh himself for a little while after the fatigue of his journey.

And since he is said to have blessed Pharaoh, by this Moses does not mean a common and profane salutation, but the pious and holy prayer of a servant of God. For the children of this world greet kings and princes for the sake of honor, but by no means raise their thoughts to God.

Jacob acts otherwise; for he adds to civil reverence that pious affection which causes him to commend the safety of the king to God. And Jeremiah prescribes this rule to the Jews, that they should pray for the peace of Babylon as long as they were to live in exile, because in the peace of that land and empire their own peace would be involved (Jeremiah 29:7). If this duty was enjoined on miserable captives, forcibly deprived of their liberty and torn from their own country, how much more did Jacob owe it to a king so humane and beneficent? But whatever character those who rule over us may have, we are commanded to offer up public prayers for them (1 Timothy 2:1). Therefore, the same subjection to authority is required from each of us individually.