Pray is today's verb. "It" is the pronoun.
On. Over. Through. Propositions connecting pray and it.
On ---can express location of in contact with
Over---at a higher level or layer
Through---a process from start to finish
"It" can be the Bible. God's Word. On a word from a verse.
"It" can be the same word or verse. Pray over again and again using different versions each time to add to deeper understanding.
"It" can be through an entirety of a book of the Bible, a chapter, or verses from start to finish to gain context of true meaning
GO for "it!"......using any prepositions necessary to aid your prayer life!