There are accounts of prayer throughout the Bible. One stark episode is a "pray-off" between the prophet Elijah and the prophets of Baal. Needless to say, Elijah's prayer worked. But in the new testament, Jesus' disciples also ask the Lord to teach them - and us - to pray... No sooner said than done. God is always ready to listen to us in prayer.
Readings (available at https://biblegateway.com - ESV):
9:00 am - Bible Study
10:00 am - Worship