Luke 2:37

She was very old; from girlhood she had lived seven years with a husband, and now had been a widow eighty years. She never left the temple, but continued to worship all day and all night with fastings and prayers.

1 Timothy 5:5

But a woman who is really a widow and lives alone has fixed her hope on God, and night and day devotes herself to prayers and entreaties,

Acts 14:23

They helped them select elders in each church, and after praying and fasting they committed them to the Lord in whom they had believed.

Luke 5:33

After that they said to Him, "John's disciples rigidly practice fasting and offering up prayers; so do the Pharisees, but your disciples keep right on eating and drinking."

Acts 13:3

So after fasting and praying, they laid their hands upon them and let them go.

Acts 26:7

which promise our twelve tribes, by devotedly worshiping day and night, hope to see fulfilled for them. It is for this hope, your Majesty, that I am accused by some Jews.

Revelation 3:12

I will make him who conquers a pillar in the temple of my God, and he shall never again go out of it. I will write on him the name of my God and the name of the city of my God, the new Jerusalem, which is coming down out of heaven from my God, and my own new name.

Revelation 7:15

This is why they are before the throne of God, and day and night serve Him in His temple, and He who is seated on His throne will shelter them in His tent.

Treasury of Scripture Knowledge

Summary

And she was a widow of about fourscore and four years, which departed not from the temple, but served God with fastings and prayers night and day.

Bible References

But

Acts 26:7
which promise our twelve tribes, by devotedly worshiping day and night, hope to see fulfilled for them. It is for this hope, your Majesty, that I am accused by some Jews.
1 Timothy 5:5
But a woman who is really a widow and lives alone has fixed her hope on God, and night and day devotes herself to prayers and entreaties,
Revelation 7:15
This is why they are before the throne of God, and day and night serve Him in His temple, and He who is seated on His throne will shelter them in His tent.