Matthew 25:35 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: 36 Naked, and ye clothed me: I was sick, and ye visited me: I was in prison, and ye came unto me. 37 Then shall the righteous answer him, saying, Lord, when saw we thee an hungred, and fed thee? or thirsty, and gave thee drink? 38 When saw we thee a stranger, and took thee in? or naked, and clothed thee? 39 Or when saw we thee sick, or in prison, and came unto thee? 40 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. 41 Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels: 42 For I was an hungred, and ye gave me no meat: I was thirsty, and ye gave me no drink: 43 I was a stranger, and ye took me not in: naked, and ye clothed me not: sick, and in prison, and ye visited me not. 44 Then shall they also answer him, saying, Lord, when saw we thee an hungred, or athirst, or a stranger, or naked, or sick, or in prison, and did not minister unto thee? 45 Then shall he answer them, saying, Verily I say unto you, Inasmuch as ye did it not to one of the least of these, ye did it not to me. 46 And these shall go away into everlasting punishment: but the righteous into life eternal.
You seem to be asking for a rule in order to apply it to a principle.
It does not matter what other people say.
What matters is that, having believed the gospel and been baptised, we apply the teaching of Christ in our lives.
The principle is plain:
Matthew 5:42 Give to him that asketh thee, and from him that would borrow of thee turn not thou away.
Matthew 6:3 But when thou doest alms, let not thy left hand know what thy right hand doeth:
Mark 14:7 For ye have the poor with you always, and whensoever ye will ye may do them good...
NKJV Luke 6:38 "Give, and it will be given to you: good measure, pressed down, shaken together, and running over will be put into your bosom. For with the same measure that you use, it will be measured back to you."
Luke 11:41 But rather give alms of such things as ye have; and, behold, all things are clean unto you.
Luke 12:33 Sell that ye have, and give alms; provide yourselves bags which wax not old, a treasure in the heavens that faileth not, where no thief approacheth, neither moth corrupteth.
1 Corinthians 16:1 Now concerning the collection for the saints, as I have given order to the churches of Galatia, even so do ye. 2 Upon the first day of the week let every one of you lay by him in store, as God hath prospered him, that there be no gatherings when I come.
2 Corinthians 8:12 For if there be first a willing mind, it is accepted according to that a man hath, and not according to that he hath not. 13 For I mean not that other men be eased, and ye burdened: 14 But by an equality, that now at this time your abundance may be a supply for their want, that their abundance also may be a supply for your want: that there may be equality: 15 As it is written, He that had gathered much had nothing over; and he that had gathered little had no lack.
Galatians 6:10 As we have therefore opportunity, let us do good unto all men, especially unto them who are of the household of faith.
Ephesians 4:28 Let him that stole steal no more: but rather let him labour, working with his hands the thing which is good, that he may have to give to him that needeth.
James 2:14 What doth it profit, my brethren, though a man say he hath faith, and have not works? can faith save him? 15 If a brother or sister be naked, and destitute of daily food, 16 And one of you say unto them, Depart in peace, be ye warmed and filled; notwithstanding ye give them not those things which are needful to the body; what doth it profit? 17 Even so faith, if it hath not works, is dead, being alone. 18 Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works.
I cannot give you a rule concerning giving to others.Neither should we judge others in this respect.There are always exceptions to rules. Matthew 7:6 is also a principle.
Matthew 7:6 Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.
Each of us must give according to our own circumstances, applying the principle as our conscience (informed by scripture) dictates.
1 Timothy 1:5 Now the end of the commandment is charity (love) out of a pure heart, and of a good conscience, and of faith unfeigned:
Willingness to give that which we have to help others is not restricted to financial assistance and is but one aspect of a life in Christ.
1 Corinthians 13:3 And though I bestow all my goods to feed the poor... and have not charity (love), it profiteth me nothing.
I hope you have found this helpful.
May God bless you,