"Eozaheron" "يظاهرون" They relate in Arabic word "zihaar" "الظهار" which is derived from "AL Zohar" "الظهر"
Were Arabs in Jaahiliyyah , if someone Zahara"ظاهر" from his wife, who told her: "You are on myself as Zahr of my mother" "انت عليّ كظهر أمي"
And zihaar in the Jaahiliyyah was divorce, and God making for this divorce expiation,so did not make it a divorce as Arab in Jaahiliyyah considered it.
and in another ayah describes this meaning explicitly and clearly:
" الَّذِينَ يُظَاهِرُونَ مِنكُم مِّن نِّسَائِهِم مَّا هُنَّ أُمَّهَاتِهِمْ ۖ إِنْ أُمَّهَاتُهُمْ إِلَّا اللَّائِي وَلَدْنَهُمْ ۚ
وَإِنَّهُمْ لَيَقُولُونَ مُنكَرًا مِّنَ الْقَوْلِ وَزُورًا ۚ وَإِنَّ
اللَّـهَ لَعَفُوٌّ غَفُورٌ "
Those of you who divorce your wives by calling them 'mothers,' cannot
(make them) their mothers. Their mothers are only those who gave birth
to them. They surely utter what is unseemly and a lie. But God is
forbearing and forgiving. [58:2]
"then revoke what they had said"
"ثم يعودون لما قالوا"
There are several sayings and explanations for this:
Some people said: to returning to term zihaar so repeat it, and this
statement is invalid.
Imam Shafei said: that is holding his wife after "zihaar" divorce
while you can to divorce her and didn't divorce.
And Ahmad ibn Hanbal said: is that return to intercourse or insist
upon, is not permissible for him until expiate in this expiation.
Abu Hanifa said: is returning to divorce (zihaar) after forbidden it
and lift what it was is Jaahiliyyah, when man divorce (Zahir) his
wife, he forbidden her, not bump up except offer expiation.
The expiation is explaining in the rest of ayah:
" فَتَحْرِيرُ رَقَبَةٍ مِّن قَبْلِ أَن يَتَمَاسَّا ۚ ذَٰلِكُمْ تُوعَظُونَ بِهِ ۚ وَاللَّـهُ بِمَا تَعْمَلُونَ خَبِيرٌ،فَمَن لَّمْ
يَجِدْ فَصِيَامُ شَهْرَيْنِ مُتَتَابِعَيْنِ مِن قَبْلِ أَن يَتَمَاسَّا
ۖ فَمَن لَّمْ يَسْتَطِعْ فَإِطْعَامُ سِتِّينَ مِسْكِينًا ۚ ذَٰلِكَ
لِتُؤْمِنُوا بِاللَّـهِ وَرَسُولِهِ ۚ وَتِلْكَ حُدُودُ اللَّـهِ ۗ
وَلِلْكَافِرِينَ عَذَابٌ أَلِيمٌ "
should free a slave before having physical contact (with them). This
is to warn you, as God is aware of what you do,If one does not have
the means (of doing so) then he should fast for two months
continuously before he has physical contact; but any one who is unable
to do so, should feed sixty needy persons. This (is enjoined) so that
you may be faithful to God and His Apostle. These are the limits set
by God. As for the unbelievers, there is painful punishment for them.