Praying for Others, Intercessory Prayer

Does God teach us to pray for one another?
"Moreover as for me, God forbid that I should sin against the LORD in ceasing to pray for you: but I will teach you the good and the right way:" 1 Samuel 12:23

"If any man see his brother sin a sin [which is] not unto death, he shall ask, and he shall give him life for them that sin not unto death. There is a sin unto death: I do not say that he shall pray for it." 1 John 5:16

"Is any sick among you? let him call for the elders of the church; and let them pray over him, anointing him with oil in the name of the Lord:" James 5:14

Can we pray for the weather? Can we ,who are sinners, be effective in any prayer?
"Elias was a man subject to like passions as we are, and he prayed earnestly that it might not rain: and it rained not on the earth by the space of three years and six months."
"And he prayed again, and the heaven gave rain, and the earth brought forth her fruit." James 5:17,18


What kind of prayer should this be?
"Oh, that one might plead for a man with God, as a man pleadeth for his neighbor!" Job 16:21

Let us claim hold of GOD's promise for ourselve and for others.