Zayd bin Arqam (may Allah be pleased with him) said: We set out with the Prophet (peace and blessings be upon him) on a journey in which the people suffered great hardship. Abdullah bin Ubayy said to his companions: "Do not spend on those who are with the Messenger of Allah until they disperse from around him," and: "When we return to Madinah, we will expel these humiliated ones from it; we are the honourable." I heard this and went and told the Prophet (peace and blessings be upon him). He (peace and blessings be upon him) summoned him and asked, and he swore an oath that he had said nothing of the sort. The people began to say: Zayd has lied to the Prophet (peace and blessings be upon him). What they said weighed upon my heart, until Allah Almighty revealed Surah al-Munafiqun confirming me. Then the Prophet (peace and blessings be upon him) called them and said: "Come, let me pray for your forgiveness," but they turned their heads away. These people were very handsome.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المرتد / 16838