1. I am Mormon
2. Thank you
3. There isn't a part of the Bible where it says to ONLY care for some of the poor and needy because it reminds us we need to serve everyone, and there really isn't any criteria for it since we should love and care for all. But here are some verses for caring for poor and needy people. (KJV):
Luke 14:12-14- Then said he also to him that bade him, When thou makest a dinner or a supper, call not thy friends, nor thy brethren, neither thy kinsmen, nor thy rich neighbours; lest they also bid thee again, and a recompence be made thee. But when thou makest a feast, call the poor, the maimed, the lame, the blind: And thou shalt be blessed; for they cannot recompense thee: for thou shalt be recompensed at the resurrection of the just.
Matthew 25:35-40- For I was an hungred, and ye gave me meat: I was thirsty, and ye gave me drink: I was a stranger, and ye took me in: Naked, and ye clothed me: I was sick, and ye visited me: I was in prison, and ye came unto me. Then shall the righteous answer him, saying, Lord, when saw we thee an hungred, and fed thee? or thirsty, and gave thee drink? When saw we thee a stranger, and took thee in? or naked, and clothed thee? Or when saw we thee sick, or in prison, and came unto thee? And the King shall answer and say unto them, Verily I say unto you, Inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me.
Acts 4:32-35- And the multitude of them that believed were of one heart and of one soul: neither said any of them that ought of the things which he possessed was his own; but they had all things common. And with great power gave the apostles witness of the resurrection of the Lord Jesus: and great grace was upon them all. Neither was there any among them that lacked: for as many as were possessors of lands or houses sold them, and brought the prices of the things that were sold, And laid them down at the apostles’ feet: and distribution was made unto every man according as he had need.
In summary, we should care for all that are poor or needy of it. That's the reason churches have tithing. 10% of your income is generally encouraged. Some may see it as selfish to not tithe, but Malachi 3:10 actually means it in a different way. It was about giving produce to the land. The New Testament also doesn't command tithing, but instead generosity and proportional giving. Hebrews 7-10 tells the Levitical priesthood is replaced with Christ under the New Covenant.