The Prophet (ﷺ) said, "Wailakum" (woe to you) or "waihakum" (May Allah be merciful to you)." Shu`ba is not sure as to which was the right word. "Do not become disbelievers after me by cutting the necks of one another."
Sahih al-Bukhari Book 78, Hadith 192
← Previous Hadith A bedouin said, "O Allah's Messenger (ﷺ)! Inform me about the emigration." The Prophet (ﷺ) said, "Waihaka (May Allah be merciful to you)! The question of emigration is a difficult one. Have you got some camels?" The bedouin said, "Yes." The Prophet (ﷺ) said, "Do you pay their Zakat?" He said, "Yes." The Prophet said, "Go on doing like this from beyond the seas, for Allah will not let your deeds go in vain."

Sahih al-Bukhari Book 78, Hadith 191 Next Hadith → A bedouin came to the Prophet (ﷺ) and said, "O Allah's Messenger (ﷺ)! When will The Hour be established?" The Prophet (ﷺ) said, "Wailaka (Woe to you), What have you prepared for it?" The bedouin said, "I have not prepared anything for it, except that I love Allah and H is Apostle." The Prophet (ﷺ) said, "You will be with those whom you love." We (the companions of the Prophet (ﷺ) ) said, "And will we too be so? The Prophet (ﷺ) said, "Yes." So we became very glad on that day. In the meantime, a slave of Al-Mughira passed by, and he was of the same age as I was. The Prophet (ﷺ) said. "If this (slave) should live long, he will not reach the geriatric old age, but the Hour will be established."

Sahih al-Bukhari Book 78, Hadith 193