ἀφορίζω

Matthew 13:49 ἀφοριοῦσιν will separate

So will it be at the end of the age: The angels will come and separate the wicked from the righteous

Here: To draw a boundary and put one group on the other side of it. The same verb is used of the shepherd separating sheep from goats (25:32). The future tense says this is done at the end, by the angels.

Matthew 25:32 ἀφορίσει ἀφορίζει He will separate, separates

All the nations will be gathered before Him, and He will separate the people one from another, as a shepherd separates the sheep from the goats.

Here: Future active, 'he will separate'. The judge himself does the sorting. The word pictures drawing a boundary line between two groups that were mixed together until now.

Luke 6:22 ἀφορίσωσιν they may exclude

Blessed are you when people hate you, and when they exclude you and insult you and reject your name as evil because of the Son of Man.

Here: To draw a boundary and put someone outside it: social and religious exclusion from the community, its gatherings and its table. In the Greek Old Testament the same verb is used for the priest isolating a suspected skin disease (Lev 13).

Acts 13:2 ἀφορίσατε do set apart

While they were worshiping the Lord and fasting, the Holy Spirit said, “Set apart for Me Barnabas and Saul for the work to which I have called them.”

Here: "Set apart!" A plural command, so it is given to the group and not to Barnabas and Saul themselves. They are to mark the two men off from the rest for a particular purpose. The aorist command asks for one definite act, which verse 3 carries out.

Acts 19:9 ἀφώρισεν he took separately

But when some of them stubbornly refused to believe and publicly maligned the Way, Paul took his disciples and left the synagogue to conduct daily discussions in the lecture hall of Tyrannus.

Here: "He drew a boundary around" the disciples and took them apart as a distinct group. It is a weighty word, also used for being "set apart" for God (Acts 13:2; Rom 1:1) and for being excluded from a synagogue (Luke 6:22).

Romans 1:1 ἀφωρισμένος set apart

Paul, a servant of Christ Jesus, called to be an apostle, and set apart for the gospel of God—

Here: Perfect passive participle: 'having been set apart' (by God) and remaining so. The picture is of being marked off from everything else and reserved for one purpose, like something dedicated to God.

2 Corinthians 6:17 ἀφορίσθητε, do be separate,

“Therefore come out from among them and be separate, says the Lord. Touch no unclean thing, and I will receive you.”

Here: Aorist passive imperative: 'be set apart', 'let yourselves be marked off'. It carries the idea of drawing a boundary around something set apart for God, the word Greek Isaiah used for the priests who carried the temple vessels.

Galatians 1:15 ἀφορίσας having selected

But when God, who set me apart from my mother’s womb and called me by His grace, was pleased

Here: 'Having set apart': God marked Paul off for a particular purpose, as one sets aside an offering or appoints someone to a task. The aorist (simple past) points to God's settled act.

Galatians 2:12 ἀφώριζεν he was separating

For before certain men came from James, he used to eat with the Gentiles. But when they arrived, he began to draw back and separate himself, for fear of those in the circumcision group.

Here: 'He was separating'. This is the language of setting a boundary, the same word the Greek Old Testament uses for Israel being 'set apart from the nations' (Lev 20:26). Peter is redrawing a boundary that Paul believes the gospel has removed.