《后汉书·列传·虞傅盖臧列传》
盖勋起先与从事辛曾、孔常都驻扎阿阳，等到左昌的紧急军书到达，辛曾、孔常迟疑不肯去。
勋初与从事辛曾、孔常俱屯阿阳，及昌檄到，曾等疑不肯赴。
Gai Xun stayed in A Yang with Sin Zeng and Kong Chang when Zuochang's emergency letter arrived. Xin Zeng and Kong Chang hesitated to go.
<s>[INST] Kindly elucidate the central themes in this passage in English: 勋初与从事辛曾、孔常俱屯阿阳，及昌檄到，曾等疑不肯赴。 [/INST] Gai Xun stayed in A Yang with Sin Zeng and Kong Chang when Zuochang's emergency letter arrived. Xin Zeng and Kong Chang hesitated to go.</s>
Kindly elucidate the central themes in this passage in English: 勋初与从事辛曾、孔常俱屯阿阳，及昌檄到，曾等疑不肯赴。
user
Gai Xun stayed in A Yang with Sin Zeng and Kong Chang when Zuochang's emergency letter arrived. Xin Zeng and Kong Chang hesitated to go.
assistant