It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever holds fast to seeking forgiveness (istighfar), Allah Almighty makes for him relief from every worry and a way out of every hardship, and provides for him from where he does not expect."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Ibn Abbas (may Allah be pleased with them both) except with this chain, and al-Walid bin Muslim is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 6291
Hadith Takhrij«أخرجه الحاكم فى «المستدرك» برقم: 7772، والنسائي فى «السنن الكبرى» برقم: 10217، وأبو داود فى «سننه» برقم: 1518، وابن ماجه فى «سننه» برقم: 3819، والبيهقي فى «السنن الكبرى» برقم: 6514، وأحمد فى «مسنده» برقم: 2270، والطبراني فى «الكبير» برقم: 10665»