All of these heard from the Messenger of Allah ﷺ who said, "Complete the ablution. Woe to the heels from the Fire."
حدثنا العباس بن عثمان وعثمان بن إسمعيل الدمشقيان قالا حدثنا الوليد بن مسلم حدثنا شيبة بن الأحنف عن أبي سلام الأسود عن أبي صالح الأشعري حدثني أبو عبد الله الأشعري
كل هؤلاء سمعوا من رسول الله ﷺ قال أتموا الوضوء ويل للأعقاب من النار
Sahih. Busiri said, "This chain of transmission is hasan, I know of no weakness in its narrators." I say, Shayba was not deemed reliable by anyone except Ibn Hibban, and Walid did not explicitly state that he heard it directly in this continuous chain, but the basis of the hadith is sahih and well established through multiple transmissions.