Hadith 8:159
Narrated 'Umar (RA):
If anyone acknowledges that he is the father of his child just for the blinking of an eye, he has no right to disown it." [al-Baihaqi reported it. The Hadith is Hasan (good) and Mawquf (saying of a Companion)].
وَعَنْ عُمَرَ - رضى الله عنه - قَالَ: { مَنْ أَقَرَّ بِوَلَدٍ طَرْفَةَ عَيْنٍ, فَلَيْسَ لَهُ أَنْ يَنْفِيَهُ } . أَخْرَجَهُ اَلْبَيْهَقِيُّ, وَهُوَ حَسَنٌ مَوْقُوف ٌ