Muwatta Malik 845

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، أَنَّ أَبَاهُ، قَالَ إِذَا اضْطُرِرْتَ إِلَى بَدَنَتِكَ فَارْكَبْهَا رُكُوبًا غَيْرَ فَادِحٍ وَإِذَا اضْطُرِرْتَ إِلَى لَبَنِهَا فَاشْرَبْ بَعْدَ مَا يَرْوَى فَصِيلُهَا فَإِذَا نَحَرْتَهَا فَانْحَرْ فَصِيلَهَا مَعَهَا ‏.‏

ahya related to me from Malik from Hisham ibn Urwa that his father said, "If necessary, ride on your sacrificial animal, without burdening it, and if necessary, drink its milk after its young one has drunk its fill, and when you sacrifice it, sacrifice the young one with it

Reference

Muwatta Malik 845

In-book

Book 20, Hadith 141