《资治通鉴·唐纪·唐纪十一》
太宗派民部尚书唐俭、右领军大将军执失思力携带丝绸送给薛延陀，与他合谋共同出兵。
上遣民部尚书唐俭、右领军大将军执失思力赍缯帛赐薛延陀，与谋进取。
Emperor Taizong asked Minister of Minbu Tang Jian and General Zhishi Sili to take some silk to bribe Xue Yantuo to join the crusade.