Authentic
graded by Al-Albani
Mishkat al-Masabih 4523
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا تُعَذِّبُوا صِبْيَانَكُمْ بِالْغَمْزِ مِنَ الْعُذْرَةِ عَلَيْكُمْ بِالْقُسْطِ»
He reported God’s messenger as saying:
“Do not afflict your children by squeezing for a swelling in the uvula, but apply costus.” (Bukhari and Muslim .)
Cited in Mishkat al-Masabih (No. 4523).