When someone says “I will pray for you” or “I will pray for that person” is that Biblical?
Often James 5: 14-16 is taken as we are to pray openly as the scripture reads;
14 Is anyone among you sick? Then he must call for the elders of the church, and they are to pray over him, anointing him with oil in the name of the Lord; 15 and the prayer offered in faith will restore the one who is sick, and the Lord will raise him up, and if he has committed sins, they will be forgiven him. 16 Therefore, confess your sins to one another, and pray for one another so that you may be healed. The effective prayer of a righteous man can accomplish much.
Notice that it reads “Is anyone among you sick? Then he must call for the elders of the church and they are to pray over him, anointing him with oil in the name of the Lord;”
This clearly the “elders” of the Church are requested to pray over the sick. There is a big difference between that and “stating” that “you” will pray for the sick. We are to pray for the sick individually as Christians in private. Any way else is boasting. Read the following scripture;
Matthew 6: 1-8 (NASB)
6 “Beware of practicing your righteousness before men to be noticed by them; otherwise, you have no reward with your Father who is in heaven.
2 “So when you give to the poor, do not sound a trumpet before you, as the hypocrites do in the synagogues and the streets so that they may be honored by men. Truly I say to you; they have their reward in full. 3 But when you give to the poor, do not let your left hand know what your right hand is doing, 4 so that your giving will be in secret, and your Father who sees what is done in secret will reward you.
5 “When you pray, you are not to be like the hypocrites; for they love to stand and pray in the synagogues and on the street corners so that they may be seen by men. Truly I say to you; they have their reward in full. 6 But you, when you pray, go into your inner room, close your door and pray to your Father who is in secret, and your Father who sees what is done in secret will reward you.
7 “And when you are praying, do not use meaningless repetition as the Gentiles do, for they suppose that they will be heard for their many words. 8 So do not be like them; for your Father knows what you need before you ask Him.
In James 5: 16 it reads “16 Therefore, confess your sins to one another, and pray for one another so that you may be healed.”
That does not say to pray publicly. Pray in fellowship, in private and from your heart.