Arabic (Original)
وَبِهَذَا الْإِسْنَادِ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِنَّ التَّثَاؤُبَ مِنْ الشَّيْطَانِ فَإِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيَكْظِمْ مَا اسْتَطَاعَ.
English Translation
And with this chain of narration, the Messenger of Allah (peace be upon him) said: "Yawning is from Satan. So when one of you yawns, let him suppress it as much as he can."