Section 2 Mishkat al-Masabih 4091, 4092

Arabic hadith text
وَعَنْ جَابِرٌ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «ذَكَاةُ الْجَنِينِ ذَكَاةُ أُمِّهِ» . رَوَاهُ أَبُو دَاوُد والدارمي وَرَوَاهُ التِّرْمِذِيّ عَن أبي سعيد
Translation

Jabir reported the Prophet as saying, “The slaughter of the embryo is included when its mother is slaughtered.” Abu Dawud and Darimi transmitted it, and Tirmidhi transmitted it on the authority of Abu Sa‘id.