It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Love your friend moderately, for perhaps one day he may become your enemy; and hate your enemy moderately, for perhaps one day he may become your friend."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Abdullah bin Amr (may Allah be pleased with them both) only with this chain; Muhammad bin Kathir al-Fihri is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5120
Hadith Gradingمحدثین:إسناده ضعيف لضعف محمد بن كثير الفهري
Hadith Takhrij«قال الهيثمي: فيه محمد بن كثير الفهري وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 8، ص 88»» «أخرجه الطبراني فى «الكبير» برقم: 14755»