بُلُوغُ الْمَرَامِ
Bulugh al-Maram 1101
Marriage
وَعَنْ عُمَرَ - رضى الله عنه - قَالَ: { مَنْ أَقَرَّ بِوَلَدٍ طَرْفَةَ عَيْنٍ, فَلَيْسَ لَهُ أَنْ يَنْفِيَهُ } . أَخْرَجَهُ اَلْبَيْهَقِيُّ, وَهُوَ حَسَنٌ مَوْقُوف ٌ [1] .
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)].
Sunnah.com reference: Book 8, Hadith 159