ذِكْرُ الْأَمْرِ بِكَظْمِ الْمَرْءِ التَّثَاؤُبَ مَا اسْتَطَاعَ ذَلِكَ
The yawning as from the devil. So when one of you yawns he should try to restrain it as far as it lies in his power. (Using translation from Muslim 2994)
أَنَّ النَّبِيَّ ﷺ قَالَ «التَّثَاؤُبُ مِنَ الشَّيْطَانِ إِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيَكْظِمْ مَا اسْتَطَاعَ»