It is narrated from Sayyiduna Ka'b bin Malik (may Allah be pleased with him) that when Allah Almighty revealed concerning poetry the (verses) He revealed, he came to the Messenger of Allah (peace and blessings be upon him) and said: "O Messenger of Allah, Allah, the Mighty and Majestic, has revealed concerning poetry what you know; so what is your view on it now?" The Messenger of Allah (peace and blessings be upon him) said: "Indeed, the believer strives (in jihad) with his sword and with his tongue (both)."
No one narrated these hadiths from Ishaq (may Allah have mercy on him) except Attab (may Allah have mercy on him).
Hadith Referenceالمعجم الأوسط / باب الألف / 669
Hadith Takhrij«أخرجه ابن حبان فى «صحيحه» برقم: 4707، 5786، والبيهقي فى «السنن الكبرى» برقم: 21170، 21172، وأحمد فى «مسنده» برقم: 16026، 16028، 16038، 27818، وعبد الرزاق فى «مصنفه» برقم: 20500، والطبراني فى «الكبير» برقم: 153، 151، 152، والطبراني فى «الأوسط» برقم: 209»