It is a good omen.

Now I am glad that the Roman spared my life, that in a day to come I may take his--and Miriam." Then he turned and trudged onward through the glorious sunlight, watching his own shadow that stretched away before him.
"It goes far," he said again; "this also is a very good omen." Caleb thought much on his way to Jerusalem; moreover he talked with all whom he met, even with bandits and footpads whom his poverty could not tempt, for he desired to learn how matters stood in the land.

Arrived in Jerusalem he sought out the home of that lady who had been his mother's friend and who gave him over, a helpless orphan, to the care of the Essenes.

He found that she was dead, but her son lived, a man of kind heart and given to hospitality, who had heard his story and sheltered him for his mother's sake.

When his hand was healed and he procured some good clothes and a little money from his friend, without saying anything of his purpose, Caleb attended the court of Gessius Florus, the Roman procurator, at his palace, seeking an opportunity to speak with him.
Thrice did he wait thus for hours at a time, on each occasion to be driven away at last by the guards.