The attribution to it as well is: Sijzī. Al-Ḥāfiẓ al-Dhahabī said: Thus Abū ʿAwānah al-Isfarāyīnī attributes Abū Dāwūd—meaning the author—saying: al-Sijzī. And to it is attributed the transmitter of his time, Abū al-Waqt al-Sijzī(1).

There has been disagreement over the year in which Sijistān was conquered. Sayf ibn ʿUmar mentioned in *al-Futūḥ* that its conquest was in the year eighteen, during the caliphate of the Commander of the Faithful ʿUmar ibn al-Khaṭṭāb, may God be pleased with him, and that its conquest was undertaken by ʿĀṣim ibn ʿAmr al-Tamīmī and ʿAbd Allāh ibn ʿUmayr al-Ashjaʿī(2).

As for Khalīfah ibn Khayyāṭ and al-Balādhurī—and Ibn Ḥibbān and Ibn Ḥazm followed them—they held that its conquest was during the caliphate of the Commander of the Faithful ʿUthmān ibn ʿAffān, may God be pleased with him, and that its conquest was undertaken by al-Rabīʿ ibn Ziyād al-Ḥārithī. Al-Ḥāfiẓ al-Dhahabī confined himself to this view in *Duwal al-Islām*(3).

The two views may be reconciled by saying that the beginning of the conquest of Sijistān was in the time of ʿUmar ibn al-Khaṭṭāb, and the wars continued until its conquest was completed in the year thirty, during the caliphate of ʿUthmān ibn ʿAffān. This is because the province of Sijistān was greater than Khurāsān, larger in area, and the more rugged of the two provinces. Indeed, al-Dhahabī recorded in the events of the year twenty-three the opening of Sijistān, then mentioned in the year thirty that Ibn ʿĀmir—

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(1) Al-Dhahabī, *Siyar Aʿlām al-Nubalāʾ* 13/221.
(2) Al-Ṭabarī, *Tārīkh* 4/94.
(3) Khalīfah ibn Khayyāṭ, *Tārīkh*, p. 164; al-Balādhurī, *Futūḥ al-Buldān*, p. 385; Ibn Ḥibbān, *al-Sīrah al-Nabawiyyah wa-Akhbār al-Khulafāʾ*, p. 507; Ibn Ḥazm, *Jawāmiʿ al-Sīrah*, p. 348; al-Dhahabī, *Duwal al-Islām*, p. 22.